/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */
/* eslint-disable no-proto */

'use strict'

import * as base64 from './base64'

const ieee754 = {
    /*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */
    read: function (buffer, offset, isLE, mLen, nBytes) {
        let e, m
        const eLen = (nBytes * 8) - mLen - 1
        const eMax = (1 << eLen) - 1
        const eBias = eMax >> 1
        let nBits = -7
        let i = isLE ? (nBytes - 1) : 0
        const d = isLE ? -1 : 1
        let s = buffer[offset + i]

        i += d

        e = s & ((1 << (-nBits)) - 1)
        s >>= (-nBits)
        nBits += eLen
        while (nBits > 0) {
            e = (e * 256) + buffer[offset + i]
            i += d
            nBits -= 8
        }

        m = e & ((1 << (-nBits)) - 1)
        e >>= (-nBits)
        nBits += mLen
        while (nBits > 0) {
            m = (m * 256) + buffer[offset + i]
            i += d
            nBits -= 8
        }

        if (e === 0) {
            e = 1 - eBias
        } else if (e === eMax) {
            return m ? NaN : ((s ? -1 : 1) * Infinity)
        } else {
            m = m + Math.pow(2, mLen)
            e = e - eBias
        }
        return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
    },

    write: function (buffer, value, offset, isLE, mLen, nBytes) {
        let e, m, c
        let eLen = (nBytes * 8) - mLen - 1
        const eMax = (1 << eLen) - 1
        const eBias = eMax >> 1
        const rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
        let i = isLE ? 0 : (nBytes - 1)
        const d = isLE ? 1 : -1
        const s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

        value = Math.abs(value)

        if (isNaN(value) || value === Infinity) {
            m = isNaN(value) ? 1 : 0
            e = eMax
        } else {
            e = Math.floor(Math.log(value) / Math.LN2)
            if (value * (c = Math.pow(2, -e)) < 1) {
                e--
                c *= 2
            }
            if (e + eBias >= 1) {
                value += rt / c
            } else {
                value += rt * Math.pow(2, 1 - eBias)
            }
            if (value * c >= 2) {
                e++
                c /= 2
            }

            if (e + eBias >= eMax) {
                m = 0
                e = eMax
            } else if (e + eBias >= 1) {
                m = ((value * c) - 1) * Math.pow(2, mLen)
                e = e + eBias
            } else {
                m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
                e = 0
            }
        }

        while (mLen >= 8) {
            buffer[offset + i] = m & 0xff
            i += d
            m /= 256
            mLen -= 8
        }

        e = (e << mLen) | m
        eLen += mLen
        while (eLen > 0) {
            buffer[offset + i] = e & 0xff
            i += d
            e /= 256
            eLen -= 8
        }

        buffer[offset + i - d] |= s * 128
    }
}

const customInspectSymbol =
    (typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation
        ? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation
        : null


export const lowBuffer = SlowBuffer
export const INSPECT_MAX_BYTES = 50

const K_MAX_LENGTH = 0x7fffffff
export const kMaxLength = K_MAX_LENGTH

/**
 * Not used internally, but exported to maintain api compatability
 * Uses 32-bit implementation value from Node defined in String:kMaxLength
 *
 * @see https://github.com/nodejs/node/blob/main/deps/v8/include/v8-primitive.h#L126
 * @see https://github.com/nodejs/node/blob/main/src/node_buffer.cc#L1298
 * @see https://github.com/nodejs/node/blob/main/lib/buffer.js#L142
 */
const K_STRING_MAX_LENGTH = (1 << 28) - 16
export const kStringMaxLength = K_STRING_MAX_LENGTH

export const constants = {
    MAX_LENGTH: K_MAX_LENGTH,
    MAX_STRING_LENGTH: K_STRING_MAX_LENGTH
}

/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Print warning and recommend using `buffer` v4.x which has an Object
 *               implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * We report that the browser does not support typed arrays if the are not subclassable
 * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
 * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
 * for __proto__ and has a buggy typed array implementation.
 */
Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()

if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
    typeof console.error === 'function') {
    console.error(
        'This browser lacks typed array (Uint8Array) support which is required by ' +
        '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
    )
}

function typedArraySupport() {
    // Can typed array instances be augmented?
    try {
        const arr = new Uint8Array(1)
        const proto = { foo: function () { return 42 } }
        Object.setPrototypeOf(proto, Uint8Array.prototype)
        Object.setPrototypeOf(arr, proto)
        // @ts-ignore
        return arr.foo() === 42
    } catch (e) {
        return false
    }
}

Object.defineProperty(Buffer.prototype, 'parent', {
    enumerable: true,
    get: function () {
        if (!Buffer.isBuffer(this)) return undefined
        return this.buffer
    }
})

Object.defineProperty(Buffer.prototype, 'offset', {
    enumerable: true,
    get: function () {
        if (!Buffer.isBuffer(this)) return undefined
        return this.byteOffset
    }
})

function createBuffer(length) {
    if (length > K_MAX_LENGTH) {
        throw new RangeError('The value "' + length + '" is invalid for option "size"')
    }
    // Return an augmented `Uint8Array` instance
    const buf = new Uint8Array(length)
    Object.setPrototypeOf(buf, Buffer.prototype)
    return buf
}

/**
 * The Buffer constructor returns instances of `Uint8Array` that have their
 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
 * returns a single octet.
 *
 * The `Uint8Array` prototype remains unmodified.
 */

export function Buffer(arg, encodingOrOffset, length) {
    // Common case.
    if (typeof arg === 'number') {
        if (typeof encodingOrOffset === 'string') {
            throw new TypeError(
                'The "string" argument must be of type string. Received type number'
            )
        }
        return allocUnsafe(arg)
    }
    return from(arg, encodingOrOffset, length)
}

Buffer.poolSize = 8192 // not used by this implementation

function from(value, encodingOrOffset, length) {
    if (typeof value === 'string') {
        return fromString(value, encodingOrOffset)
    }

    if (ArrayBuffer.isView(value)) {
        return fromArrayView(value)
    }

    if (value == null) {
        throw new TypeError(
            'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
            'or Array-like Object. Received type ' + (typeof value)
        )
    }

    if (isInstance(value, ArrayBuffer) ||
        (value && isInstance(value.buffer, ArrayBuffer))) {
        return fromArrayBuffer(value, encodingOrOffset, length)
    }

    if (typeof SharedArrayBuffer !== 'undefined' &&
        (isInstance(value, SharedArrayBuffer) ||
            (value && isInstance(value.buffer, SharedArrayBuffer)))) {
        return fromArrayBuffer(value, encodingOrOffset, length)
    }

    if (typeof value === 'number') {
        throw new TypeError(
            'The "value" argument must not be of type number. Received type number'
        )
    }

    const valueOf = value.valueOf && value.valueOf()
    if (valueOf != null && valueOf !== value) {
        return Buffer.from(valueOf, encodingOrOffset, length)
    }

    const b = fromObject(value)
    if (b) return b

    if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
        typeof value[Symbol.toPrimitive] === 'function') {
        return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length)
    }

    throw new TypeError(
        'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
        'or Array-like Object. Received type ' + (typeof value)
    )
}

/**
 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
 * if value is a number.
 * Buffer.from(str[, encoding])
 * Buffer.from(array)
 * Buffer.from(buffer)
 * Buffer.from(arrayBuffer[, byteOffset[, length]])
 **/
Buffer.from = function (value, encodingOrOffset?, length?) {
    return from(value, encodingOrOffset, length)
}

// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
// https://github.com/feross/buffer/pull/148
Object.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)
Object.setPrototypeOf(Buffer, Uint8Array)

function assertSize(size) {
    if (typeof size !== 'number') {
        throw new TypeError('"size" argument must be of type number')
    } else if (size < 0) {
        throw new RangeError('The value "' + size + '" is invalid for option "size"')
    }
}

function alloc(size, fill, encoding) {
    assertSize(size)
    if (size <= 0) {
        return createBuffer(size)
    }
    if (fill !== undefined) {
        // Only pay attention to encoding if it's a string. This
        // prevents accidentally sending in a number that would
        // be interpreted as a start offset.
        return typeof encoding === 'string'
            // @ts-ignore
            ? createBuffer(size).fill(fill, encoding)
            : createBuffer(size).fill(fill)
    }
    return createBuffer(size)
}

/**
 * Creates a new filled Buffer instance.
 * alloc(size[, fill[, encoding]])
 **/
Buffer.alloc = function (size, fill?, encoding?) {
    return alloc(size, fill, encoding)
}

function allocUnsafe(size) {
    assertSize(size)
    return createBuffer(size < 0 ? 0 : checked(size) | 0)
}

/**
 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
 * */
Buffer.allocUnsafe = function (size) {
    return allocUnsafe(size)
}
/**
 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
 */
Buffer.allocUnsafeSlow = function (size) {
    return allocUnsafe(size)
}

function fromString(string, encoding) {
    if (typeof encoding !== 'string' || encoding === '') {
        encoding = 'utf8'
    }

    if (!Buffer.isEncoding(encoding)) {
        throw new TypeError('Unknown encoding: ' + encoding)
    }

    const length = byteLength(string, encoding) | 0
    let buf = createBuffer(length)
    // @ts-ignore
    const actual = buf.write(string, encoding)

    if (actual !== length) {
        // Writing a hex string, for example, that contains invalid characters will
        // cause everything after the first invalid character to be ignored. (e.g.
        // 'abxxcd' will be treated as 'ab')
        buf = buf.slice(0, actual)
    }

    return buf
}

function fromArrayLike(array) {
    const length = array.length < 0 ? 0 : checked(array.length) | 0
    const buf = createBuffer(length)
    for (let i = 0; i < length; i += 1) {
        buf[i] = array[i] & 255
    }
    return buf
}

function fromArrayView(arrayView) {
    if (isInstance(arrayView, Uint8Array)) {
        const copy = new Uint8Array(arrayView)
        return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)
    }
    return fromArrayLike(arrayView)
}

function fromArrayBuffer(array, byteOffset, length) {
    if (byteOffset < 0 || array.byteLength < byteOffset) {
        throw new RangeError('"offset" is outside of buffer bounds')
    }

    if (array.byteLength < byteOffset + (length || 0)) {
        throw new RangeError('"length" is outside of buffer bounds')
    }

    let buf
    if (byteOffset === undefined && length === undefined) {
        buf = new Uint8Array(array)
    } else if (length === undefined) {
        buf = new Uint8Array(array, byteOffset)
    } else {
        buf = new Uint8Array(array, byteOffset, length)
    }

    // Return an augmented `Uint8Array` instance
    Object.setPrototypeOf(buf, Buffer.prototype)

    return buf
}

function fromObject(obj) {
    if (Buffer.isBuffer(obj)) {
        // Note: Probably not necessary anymore.
        const len = checked(obj.length) | 0
        const buf = createBuffer(len)

        if (buf.length === 0) {
            return buf
        }

        obj.copy(buf, 0, 0, len)
        return buf
    }

    if (obj.length !== undefined) {
        if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
            return createBuffer(0)
        }
        return fromArrayLike(obj)
    }

    if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
        return fromArrayLike(obj.data)
    }
}

function checked(length) {
    // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
    // length is NaN (which is otherwise coerced to zero.)
    if (length >= K_MAX_LENGTH) {
        throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
            'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
    }
    return length | 0
}

function SlowBuffer(length) {
    if (+length != length) { // eslint-disable-line eqeqeq
        length = 0
    }
    // @ts-ignore
    return Buffer.alloc(+length)
}

Buffer.isBuffer = function isBuffer(b) {
    return b != null && b._isBuffer === true &&
        b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
}

Buffer.compare = function compare(a, b) {
    if (!isInstance(a, Uint8Array) || !isInstance(b, Uint8Array)) {
        throw new TypeError(
            'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
        )
    }

    if (a === b) return 0

    let x = a.length
    let y = b.length

    for (let i = 0, len = Math.min(x, y); i < len; ++i) {
        if (a[i] !== b[i]) {
            x = a[i]
            y = b[i]
            break
        }
    }

    if (x < y) return -1
    if (y < x) return 1
    return 0
}

Buffer.isEncoding = function isEncoding(encoding) {
    switch (String(encoding).toLowerCase()) {
        case 'hex':
        case 'utf8':
        case 'utf-8':
        case 'ascii':
        case 'latin1':
        case 'binary':
        case 'base64':
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
            return true
        default:
            return false
    }
}

Buffer.concat = function concat(list, length) {
    if (!Array.isArray(list)) {
        throw new TypeError('"list" argument must be an Array of Buffers')
    }

    if (list.length === 0) {
        // @ts-ignore
        return Buffer.alloc(0)
    }

    let i
    if (length === undefined) {
        length = 0
        for (i = 0; i < list.length; ++i) {
            length += list[i].length
        }
    }

    const buffer = Buffer.allocUnsafe(length)
    let pos = 0
    for (i = 0; i < list.length; ++i) {
        const buf = list[i]
        if (!isInstance(buf, Uint8Array)) {
            throw new TypeError('"list" argument must be an Array of Buffers')
        }
        if (pos + buf.length > buffer.length) {
            buffer.set(buf.subarray(0, buffer.length - pos), pos)
            break
        }
        buffer.set(buf, pos)
        pos += buf.length
    }
    return buffer
}

function byteLength(string, encoding?) {
    if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
        return string.byteLength
    }
    if (typeof SharedArrayBuffer !== 'undefined' &&
        isInstance(string, SharedArrayBuffer)) {
        return string.byteLength
    }
    if (typeof string !== 'string') {
        throw new TypeError(
            'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
            'Received type ' + typeof string
        )
    }

    const len = string.length
    const mustMatch = (arguments.length > 2 && arguments[2] === true)
    if (!mustMatch && len === 0) return 0

    // Use a for loop to avoid recursion
    let loweredCase = false
    for (; ;) {
        switch (encoding) {
            case 'ascii':
            case 'latin1':
            case 'binary':
                return len
            case 'utf8':
            case 'utf-8':
                // @ts-ignore
                return utf8ToBytes(string).length
            case 'ucs2':
            case 'ucs-2':
            case 'utf16le':
            case 'utf-16le':
                return len * 2
            case 'hex':
                return len >>> 1
            case 'base64':
                return base64ToBytes(string).length
            default:
                if (loweredCase) {
                    // @ts-ignore
                    return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
                }
                encoding = ('' + encoding).toLowerCase()
                loweredCase = true
        }
    }
}
Buffer.byteLength = byteLength

function slowToString(encoding, start, end) {
    let loweredCase = false

    // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
    // property of a typed array.

    // This behaves neither like String nor Uint8Array in that we set start/end
    // to their upper/lower bounds if the value passed is out of range.
    // undefined is handled specially as per ECMA-262 6th Edition,
    // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
    if (start === undefined || start < 0) {
        start = 0
    }
    // Return early if start > this.length. Done here to prevent potential uint32
    // coercion fail below.
    if (start > this.length) {
        return ''
    }

    if (end === undefined || end > this.length) {
        end = this.length
    }

    if (end <= 0) {
        return ''
    }

    // Force coercion to uint32. This will also coerce falsey/NaN values to 0.
    end >>>= 0
    start >>>= 0

    if (end <= start) {
        return ''
    }

    if (!encoding) encoding = 'utf8'

    while (true) {
        switch (encoding) {
            case 'hex':
                return hexSlice(this, start, end)

            case 'utf8':
            case 'utf-8':
                return utf8Slice(this, start, end)

            case 'ascii':
                return asciiSlice(this, start, end)

            case 'latin1':
            case 'binary':
                return latin1Slice(this, start, end)

            case 'base64':
                return base64Slice(this, start, end)

            case 'ucs2':
            case 'ucs-2':
            case 'utf16le':
            case 'utf-16le':
                return utf16leSlice(this, start, end)

            default:
                if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
                encoding = (encoding + '').toLowerCase()
                loweredCase = true
        }
    }
}

// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
// reliably in a browserify context because there could be multiple different
// copies of the 'buffer' package in use. This method works even for Buffer
// instances that were created from another copy of the `buffer` package.
// See: https://github.com/feross/buffer/issues/154
Buffer.prototype._isBuffer = true

function swap(b, n, m) {
    const i = b[n]
    b[n] = b[m]
    b[m] = i
}

Buffer.prototype.swap16 = function swap16() {
    const len = this.length
    if (len % 2 !== 0) {
        throw new RangeError('Buffer size must be a multiple of 16-bits')
    }
    for (let i = 0; i < len; i += 2) {
        swap(this, i, i + 1)
    }
    return this
}

Buffer.prototype.swap32 = function swap32() {
    const len = this.length
    if (len % 4 !== 0) {
        throw new RangeError('Buffer size must be a multiple of 32-bits')
    }
    for (let i = 0; i < len; i += 4) {
        swap(this, i, i + 3)
        swap(this, i + 1, i + 2)
    }
    return this
}

Buffer.prototype.swap64 = function swap64() {
    const len = this.length
    if (len % 8 !== 0) {
        throw new RangeError('Buffer size must be a multiple of 64-bits')
    }
    for (let i = 0; i < len; i += 8) {
        swap(this, i, i + 7)
        swap(this, i + 1, i + 6)
        swap(this, i + 2, i + 5)
        swap(this, i + 3, i + 4)
    }
    return this
}

Buffer.prototype.toString = function toString() {
    const length = this.length
    if (length === 0) return ''
    if (arguments.length === 0) return utf8Slice(this, 0, length)
    return slowToString.apply(this, arguments)
}

Buffer.prototype.toLocaleString = Buffer.prototype.toString

Buffer.prototype.equals = function equals(b) {
    if (this === b) return true
    return Buffer.compare(this, b) === 0
}

Buffer.prototype.inspect = function inspect() {
    let str = ''
    const max = INSPECT_MAX_BYTES
    str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
    if (this.length > max) str += ' ... '
    return '<Buffer ' + str + '>'
}
if (customInspectSymbol) {
    Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect
}

Buffer.prototype.compare = function compare(target, start, end, thisStart, thisEnd) {
    if (!isInstance(target, Uint8Array)) {
        throw new TypeError(
            'The "target" argument must be one of type Buffer or Uint8Array. ' +
            'Received type ' + (typeof target)
        )
    }

    if (start === undefined) {
        start = 0
    }
    if (end === undefined) {
        end = target ? target.length : 0
    }
    if (thisStart === undefined) {
        thisStart = 0
    }
    if (thisEnd === undefined) {
        thisEnd = this.length
    }

    if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
        throw new RangeError('out of range index')
    }

    if (thisStart >= thisEnd && start >= end) {
        return 0
    }
    if (thisStart >= thisEnd) {
        return -1
    }
    if (start >= end) {
        return 1
    }

    start >>>= 0
    end >>>= 0
    thisStart >>>= 0
    thisEnd >>>= 0

    if (this === target) return 0

    let x = thisEnd - thisStart
    let y = end - start
    const len = Math.min(x, y)

    for (let i = 0; i < len; ++i) {
        if (this[thisStart + i] !== target[start + i]) {
            x = this[thisStart + i]
            y = target[start + i]
            break
        }
    }

    if (x < y) return -1
    if (y < x) return 1
    return 0
}

// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf(buffer, val, byteOffset, encoding, dir) {
    // Empty buffer means no match
    if (buffer.length === 0) return -1

    // Normalize byteOffset
    if (typeof byteOffset === 'string') {
        encoding = byteOffset
        byteOffset = 0
    } else if (byteOffset > 0x7fffffff) {
        byteOffset = 0x7fffffff
    } else if (byteOffset < -0x80000000) {
        byteOffset = -0x80000000
    }
    byteOffset = +byteOffset // Coerce to Number.
    if (numberIsNaN(byteOffset)) {
        // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
        byteOffset = dir ? 0 : (buffer.length - 1)
    }

    // Normalize byteOffset: negative offsets start from the end of the buffer
    if (byteOffset < 0) byteOffset = buffer.length + byteOffset
    if (byteOffset >= buffer.length) {
        if (dir) return -1
        else byteOffset = buffer.length - 1
    } else if (byteOffset < 0) {
        if (dir) byteOffset = 0
        else return -1
    }

    // Normalize val
    if (typeof val === 'string') {
        // @ts-ignore
        val = Buffer.from(val, encoding)
    }

    // Finally, search either indexOf (if dir is true) or lastIndexOf
    if (Buffer.isBuffer(val)) {
        // Special case: looking for empty string/buffer always fails
        if (val.length === 0) {
            return -1
        }
        return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
    } else if (typeof val === 'number') {
        val = val & 0xFF // Search for a byte value [0-255]
        if (typeof Uint8Array.prototype.indexOf === 'function') {
            if (dir) {
                return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
            } else {
                return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
            }
        }
        return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)
    }

    throw new TypeError('val must be string, number or Buffer')
}

function arrayIndexOf(arr, val, byteOffset, encoding, dir) {
    let indexSize = 1
    let arrLength = arr.length
    let valLength = val.length

    if (encoding !== undefined) {
        encoding = String(encoding).toLowerCase()
        if (encoding === 'ucs2' || encoding === 'ucs-2' ||
            encoding === 'utf16le' || encoding === 'utf-16le') {
            if (arr.length < 2 || val.length < 2) {
                return -1
            }
            indexSize = 2
            arrLength /= 2
            valLength /= 2
            byteOffset /= 2
        }
    }

    function read(buf, i) {
        if (indexSize === 1) {
            return buf[i]
        } else {
            return buf.readUInt16BE(i * indexSize)
        }
    }

    let i
    if (dir) {
        let foundIndex = -1
        for (i = byteOffset; i < arrLength; i++) {
            if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
                if (foundIndex === -1) foundIndex = i
                if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
            } else {
                if (foundIndex !== -1) i -= i - foundIndex
                foundIndex = -1
            }
        }
    } else {
        if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
        for (i = byteOffset; i >= 0; i--) {
            let found = true
            for (let j = 0; j < valLength; j++) {
                if (read(arr, i + j) !== read(val, j)) {
                    found = false
                    break
                }
            }
            if (found) return i
        }
    }

    return -1
}

Buffer.prototype.includes = function includes(val, byteOffset, encoding) {
    return this.indexOf(val, byteOffset, encoding) !== -1
}

Buffer.prototype.indexOf = function indexOf(val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
}

Buffer.prototype.lastIndexOf = function lastIndexOf(val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
}

function hexWrite(buf, string, offset, length) {
    offset = Number(offset) || 0
    const remaining = buf.length - offset
    if (!length) {
        length = remaining
    } else {
        length = Number(length)
        if (length > remaining) {
            length = remaining
        }
    }

    const strLen = string.length

    if (length > (strLen >>> 1)) {
        length = strLen >>> 1
    }

    for (let i = 0; i < length; ++i) {
        const a = string.charCodeAt(i * 2 + 0)
        const b = string.charCodeAt(i * 2 + 1)
        const hi = hexCharValueTable[a & 0x7f]
        const lo = hexCharValueTable[b & 0x7f]

        if ((a | b | hi | lo) & ~0x7f) {
            return i
        }

        buf[offset + i] = (hi << 4) | lo
    }

    return length
}

function utf8Write(buf, string, offset, length) {
    return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite(buf, string, offset, length) {
    return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function base64Write(buf, string, offset, length) {
    return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write(buf, string, offset, length) {
    return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write(string, offset, length, encoding) {
    // Buffer#write(string)
    if (offset === undefined) {
        encoding = 'utf8'
        length = this.length
        offset = 0
        // Buffer#write(string, encoding)
    } else if (length === undefined && typeof offset === 'string') {
        encoding = offset
        length = this.length
        offset = 0
        // Buffer#write(string, offset[, length][, encoding])
    } else if (isFinite(offset)) {
        offset = offset >>> 0
        if (isFinite(length)) {
            length = length >>> 0
            if (encoding === undefined) encoding = 'utf8'
        } else {
            encoding = length
            length = undefined
        }
    } else {
        throw new Error(
            'Buffer.write(string, encoding, offset[, length]) is no longer supported'
        )
    }

    const remaining = this.length - offset
    if (length === undefined || length > remaining) length = remaining

    if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
        throw new RangeError('Attempt to write outside buffer bounds')
    }

    if (!encoding) encoding = 'utf8'

    let loweredCase = false
    for (; ;) {
        switch (encoding) {
            case 'hex':
                return hexWrite(this, string, offset, length)

            case 'utf8':
            case 'utf-8':
                return utf8Write(this, string, offset, length)

            case 'ascii':
            case 'latin1':
            case 'binary':
                return asciiWrite(this, string, offset, length)

            case 'base64':
                // Warning: maxLength not taken into account in base64Write
                return base64Write(this, string, offset, length)

            case 'ucs2':
            case 'ucs-2':
            case 'utf16le':
            case 'utf-16le':
                return ucs2Write(this, string, offset, length)

            default:
                if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
                encoding = ('' + encoding).toLowerCase()
                loweredCase = true
        }
    }
}

Buffer.prototype.toJSON = function toJSON() {
    return {
        type: 'Buffer',
        data: Array.prototype.slice.call(this, 0)
    }
}

function base64Slice(buf, start, end) {
    if (start === 0 && end === buf.length) {
        return base64.fromByteArray(buf)
    } else {
        return base64.fromByteArray(buf.slice(start, end))
    }
}

export function utf8Slice(buf, start, end) {
    end = Math.min(buf.length, end)
    const res = []

    let i = start
    while (i < end) {
        const firstByte = buf[i]
        let codePoint = null
        let bytesPerSequence = (firstByte > 0xEF)
            ? 4
            : (firstByte > 0xDF)
                ? 3
                : (firstByte > 0xBF)
                    ? 2
                    : 1

        if (i + bytesPerSequence <= end) {
            let secondByte, thirdByte, fourthByte, tempCodePoint

            switch (bytesPerSequence) {
                case 1:
                    if (firstByte < 0x80) {
                        codePoint = firstByte
                    }
                    break
                case 2:
                    secondByte = buf[i + 1]
                    if ((secondByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
                        if (tempCodePoint > 0x7F) {
                            codePoint = tempCodePoint
                        }
                    }
                    break
                case 3:
                    secondByte = buf[i + 1]
                    thirdByte = buf[i + 2]
                    if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
                        if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                            codePoint = tempCodePoint
                        }
                    }
                    break
                case 4:
                    secondByte = buf[i + 1]
                    thirdByte = buf[i + 2]
                    fourthByte = buf[i + 3]
                    if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
                        if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                            codePoint = tempCodePoint
                        }
                    }
            }
        }

        if (codePoint === null) {
            // we did not generate a valid codePoint so insert a
            // replacement char (U+FFFD) and advance only 1 byte
            codePoint = 0xFFFD
            bytesPerSequence = 1
        } else if (codePoint > 0xFFFF) {
            // encode to utf16 (surrogate pair dance)
            codePoint -= 0x10000
            res.push(codePoint >>> 10 & 0x3FF | 0xD800)
            codePoint = 0xDC00 | codePoint & 0x3FF
        }

        res.push(codePoint)
        i += bytesPerSequence
    }

    return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
const MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray(codePoints) {
    const len = codePoints.length
    if (len <= MAX_ARGUMENTS_LENGTH) {
        return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
    }

    // Decode in chunks to avoid "call stack size exceeded".
    let res = ''
    let i = 0
    while (i < len) {
        res += String.fromCharCode.apply(
            String,
            codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
        )
    }
    return res
}

function asciiSlice(buf, start, end) {
    let ret = ''
    end = Math.min(buf.length, end)

    for (let i = start; i < end; ++i) {
        ret += String.fromCharCode(buf[i] & 0x7F)
    }
    return ret
}

function latin1Slice(buf, start, end) {
    let ret = ''
    end = Math.min(buf.length, end)

    for (let i = start; i < end; ++i) {
        ret += String.fromCharCode(buf[i])
    }
    return ret
}

function hexSlice(buf, start, end) {
    const len = buf.length

    if (!start || start < 0) start = 0
    if (!end || end < 0 || end > len) end = len

    let out = ''
    for (let i = start; i < end; ++i) {
        out += hexSliceLookupTable[buf[i]]
    }
    return out
}

function utf16leSlice(buf, start, end) {
    const bytes = buf.slice(start, end)
    let res = ''
    // If bytes.length is odd, the last 8 bits must be ignored (same as node.js)
    for (let i = 0; i < bytes.length - 1; i += 2) {
        res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
    }
    return res
}

Buffer.prototype.slice = function slice(start, end) {
    const len = this.length
    start = ~~start
    end = end === undefined ? len : ~~end

    if (start < 0) {
        start += len
        if (start < 0) start = 0
    } else if (start > len) {
        start = len
    }

    if (end < 0) {
        end += len
        if (end < 0) end = 0
    } else if (end > len) {
        end = len
    }

    if (end < start) end = start

    const newBuf = this.subarray(start, end)
    // Return an augmented `Uint8Array` instance
    Object.setPrototypeOf(newBuf, Buffer.prototype)

    return newBuf
}

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset(offset, ext, length) {
    if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
    if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer.prototype.readUintLE =
    Buffer.prototype.readUIntLE = function readUIntLE(offset, byteLength, noAssert) {
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) checkOffset(offset, byteLength, this.length)

        let val = this[offset]
        let mul = 1
        let i = 0
        while (++i < byteLength && (mul *= 0x100)) {
            val += this[offset + i] * mul
        }

        return val
    }

Buffer.prototype.readUintBE =
    Buffer.prototype.readUIntBE = function readUIntBE(offset, byteLength, noAssert) {
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) {
            checkOffset(offset, byteLength, this.length)
        }

        let val = this[offset + --byteLength]
        let mul = 1
        while (byteLength > 0 && (mul *= 0x100)) {
            val += this[offset + --byteLength] * mul
        }

        return val
    }

Buffer.prototype.readUint8 =
    Buffer.prototype.readUInt8 = function readUInt8(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 1, this.length)
        return this[offset]
    }

Buffer.prototype.readUint16LE =
    Buffer.prototype.readUInt16LE = function readUInt16LE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 2, this.length)
        return this[offset] | (this[offset + 1] << 8)
    }

Buffer.prototype.readUint16BE =
    Buffer.prototype.readUInt16BE = function readUInt16BE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 2, this.length)
        return (this[offset] << 8) | this[offset + 1]
    }

Buffer.prototype.readUint32LE =
    Buffer.prototype.readUInt32LE = function readUInt32LE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 4, this.length)

        return ((this[offset]) |
            (this[offset + 1] << 8) |
            (this[offset + 2] << 16)) +
            (this[offset + 3] * 0x1000000)
    }

Buffer.prototype.readUint32BE =
    Buffer.prototype.readUInt32BE = function readUInt32BE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 4, this.length)

        return (this[offset] * 0x1000000) +
            ((this[offset + 1] << 16) |
                (this[offset + 2] << 8) |
                this[offset + 3])
    }

Buffer.prototype.readBigUInt64LE = defineBigIntMethod(function readBigUInt64LE(offset) {
    offset = offset >>> 0
    validateNumber(offset, 'offset')
    const first = this[offset]
    const last = this[offset + 7]
    if (first === undefined || last === undefined) {
        // @ts-ignore
        boundsError(offset, this.length - 8)
    }

    const lo = first +
        this[++offset] * 2 ** 8 +
        this[++offset] * 2 ** 16 +
        this[++offset] * 2 ** 24

    const hi = this[++offset] +
        this[++offset] * 2 ** 8 +
        this[++offset] * 2 ** 16 +
        last * 2 ** 24

    return BigInt(lo) + (BigInt(hi) << BigInt(32))
})

Buffer.prototype.readBigUInt64BE = defineBigIntMethod(function readBigUInt64BE(offset) {
    offset = offset >>> 0
    validateNumber(offset, 'offset')
    const first = this[offset]
    const last = this[offset + 7]
    if (first === undefined || last === undefined) {
        // @ts-ignore
        boundsError(offset, this.length - 8)
    }

    const hi = first * 2 ** 24 +
        this[++offset] * 2 ** 16 +
        this[++offset] * 2 ** 8 +
        this[++offset]

    const lo = this[++offset] * 2 ** 24 +
        this[++offset] * 2 ** 16 +
        this[++offset] * 2 ** 8 +
        last

    return (BigInt(hi) << BigInt(32)) + BigInt(lo)
})

Buffer.prototype.readIntLE = function readIntLE(offset, byteLength, noAssert) {
    offset = offset >>> 0
    byteLength = byteLength >>> 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)

    let val = this[offset]
    let mul = 1
    let i = 0
    while (++i < byteLength && (mul *= 0x100)) {
        val += this[offset + i] * mul
    }
    mul *= 0x80

    if (val >= mul) val -= Math.pow(2, 8 * byteLength)

    return val
}

Buffer.prototype.readIntBE = function readIntBE(offset, byteLength, noAssert) {
    offset = offset >>> 0
    byteLength = byteLength >>> 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)

    let i = byteLength
    let mul = 1
    let val = this[offset + --i]
    while (i > 0 && (mul *= 0x100)) {
        val += this[offset + --i] * mul
    }
    mul *= 0x80

    if (val >= mul) val -= Math.pow(2, 8 * byteLength)

    return val
}

Buffer.prototype.readInt8 = function readInt8(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 1, this.length)
    if (!(this[offset] & 0x80)) return (this[offset])
    return ((0xff - this[offset] + 1) * -1)
}

Buffer.prototype.readInt16LE = function readInt16LE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 2, this.length)
    const val = this[offset] | (this[offset + 1] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt16BE = function readInt16BE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 2, this.length)
    const val = this[offset + 1] | (this[offset] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt32LE = function readInt32LE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)

    return (this[offset]) |
        (this[offset + 1] << 8) |
        (this[offset + 2] << 16) |
        (this[offset + 3] << 24)
}

Buffer.prototype.readInt32BE = function readInt32BE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)

    return (this[offset] << 24) |
        (this[offset + 1] << 16) |
        (this[offset + 2] << 8) |
        (this[offset + 3])
}

Buffer.prototype.readBigInt64LE = defineBigIntMethod(function readBigInt64LE(offset) {
    offset = offset >>> 0
    validateNumber(offset, 'offset')
    const first = this[offset]
    const last = this[offset + 7]
    if (first === undefined || last === undefined) {
        // @ts-ignore
        boundsError(offset, this.length - 8)
    }

    const val = this[offset + 4] +
        this[offset + 5] * 2 ** 8 +
        this[offset + 6] * 2 ** 16 +
        (last << 24) // Overflow

    return (BigInt(val) << BigInt(32)) +
        BigInt(first +
            this[++offset] * 2 ** 8 +
            this[++offset] * 2 ** 16 +
            this[++offset] * 2 ** 24)
})

Buffer.prototype.readBigInt64BE = defineBigIntMethod(function readBigInt64BE(offset) {
    offset = offset >>> 0
    validateNumber(offset, 'offset')
    const first = this[offset]
    const last = this[offset + 7]
    if (first === undefined || last === undefined) {
        // @ts-ignore
        boundsError(offset, this.length - 8)
    }

    const val = (first << 24) + // Overflow
        this[++offset] * 2 ** 16 +
        this[++offset] * 2 ** 8 +
        this[++offset]

    return (BigInt(val) << BigInt(32)) +
        BigInt(this[++offset] * 2 ** 24 +
            this[++offset] * 2 ** 16 +
            this[++offset] * 2 ** 8 +
            last)
})

Buffer.prototype.readFloatLE = function readFloatLE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, true, 23, 4)
}

Buffer.prototype.readFloatBE = function readFloatBE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, false, 23, 4)
}

Buffer.prototype.readDoubleLE = function readDoubleLE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, true, 52, 8)
}

Buffer.prototype.readDoubleBE = function readDoubleBE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, false, 52, 8)
}

function checkInt(buf, value, offset, ext, max, min) {
    if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
    if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
}

Buffer.prototype.writeUintLE =
    Buffer.prototype.writeUIntLE = function writeUIntLE(value, offset, byteLength, noAssert) {
        value = +value
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) {
            const maxBytes = Math.pow(2, 8 * byteLength) - 1
            checkInt(this, value, offset, byteLength, maxBytes, 0)
        }

        let mul = 1
        let i = 0
        this[offset] = value & 0xFF
        while (++i < byteLength && (mul *= 0x100)) {
            this[offset + i] = (value / mul) & 0xFF
        }

        return offset + byteLength
    }

Buffer.prototype.writeUintBE =
    Buffer.prototype.writeUIntBE = function writeUIntBE(value, offset, byteLength, noAssert) {
        value = +value
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) {
            const maxBytes = Math.pow(2, 8 * byteLength) - 1
            checkInt(this, value, offset, byteLength, maxBytes, 0)
        }

        let i = byteLength - 1
        let mul = 1
        this[offset + i] = value & 0xFF
        while (--i >= 0 && (mul *= 0x100)) {
            this[offset + i] = (value / mul) & 0xFF
        }

        return offset + byteLength
    }

Buffer.prototype.writeUint8 =
    Buffer.prototype.writeUInt8 = function writeUInt8(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
        this[offset] = (value & 0xff)
        return offset + 1
    }

Buffer.prototype.writeUint16LE =
    Buffer.prototype.writeUInt16LE = function writeUInt16LE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
        this[offset] = (value & 0xff)
        this[offset + 1] = (value >>> 8)
        return offset + 2
    }

Buffer.prototype.writeUint16BE =
    Buffer.prototype.writeUInt16BE = function writeUInt16BE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
        this[offset] = (value >>> 8)
        this[offset + 1] = (value & 0xff)
        return offset + 2
    }

Buffer.prototype.writeUint32LE =
    Buffer.prototype.writeUInt32LE = function writeUInt32LE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
        this[offset + 3] = (value >>> 24)
        this[offset + 2] = (value >>> 16)
        this[offset + 1] = (value >>> 8)
        this[offset] = (value & 0xff)
        return offset + 4
    }

Buffer.prototype.writeUint32BE =
    Buffer.prototype.writeUInt32BE = function writeUInt32BE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
        this[offset] = (value >>> 24)
        this[offset + 1] = (value >>> 16)
        this[offset + 2] = (value >>> 8)
        this[offset + 3] = (value & 0xff)
        return offset + 4
    }

function wrtBigUInt64LE(buf, value, offset, min, max) {
    checkIntBI(value, min, max, buf, offset, 7)

    let lo = Number(value & BigInt(0xffffffff))
    buf[offset++] = lo
    lo = lo >> 8
    buf[offset++] = lo
    lo = lo >> 8
    buf[offset++] = lo
    lo = lo >> 8
    buf[offset++] = lo
    let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))
    buf[offset++] = hi
    hi = hi >> 8
    buf[offset++] = hi
    hi = hi >> 8
    buf[offset++] = hi
    hi = hi >> 8
    buf[offset++] = hi
    return offset
}

function wrtBigUInt64BE(buf, value, offset, min, max) {
    checkIntBI(value, min, max, buf, offset, 7)

    let lo = Number(value & BigInt(0xffffffff))
    buf[offset + 7] = lo
    lo = lo >> 8
    buf[offset + 6] = lo
    lo = lo >> 8
    buf[offset + 5] = lo
    lo = lo >> 8
    buf[offset + 4] = lo
    let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))
    buf[offset + 3] = hi
    hi = hi >> 8
    buf[offset + 2] = hi
    hi = hi >> 8
    buf[offset + 1] = hi
    hi = hi >> 8
    buf[offset] = hi
    return offset + 8
}

Buffer.prototype.writeBigUInt64LE = defineBigIntMethod(function writeBigUInt64LE(value, offset = 0) {
    return wrtBigUInt64LE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))
})

Buffer.prototype.writeBigUInt64BE = defineBigIntMethod(function writeBigUInt64BE(value, offset = 0) {
    return wrtBigUInt64BE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))
})

Buffer.prototype.writeIntLE = function writeIntLE(value, offset, byteLength, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
        const limit = Math.pow(2, (8 * byteLength) - 1)

        checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }

    let i = 0
    let mul = 1
    let sub = 0
    this[offset] = value & 0xFF
    while (++i < byteLength && (mul *= 0x100)) {
        if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
            sub = 1
        }
        this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }

    return offset + byteLength
}

Buffer.prototype.writeIntBE = function writeIntBE(value, offset, byteLength, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
        const limit = Math.pow(2, (8 * byteLength) - 1)

        checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }

    let i = byteLength - 1
    let mul = 1
    let sub = 0
    this[offset + i] = value & 0xFF
    while (--i >= 0 && (mul *= 0x100)) {
        if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
            sub = 1
        }
        this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }

    return offset + byteLength
}

Buffer.prototype.writeInt8 = function writeInt8(value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
    if (value < 0) value = 0xff + value + 1
    this[offset] = (value & 0xff)
    return offset + 1
}

Buffer.prototype.writeInt16LE = function writeInt16LE(value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
    return offset + 2
}

Buffer.prototype.writeInt16BE = function writeInt16BE(value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    this[offset] = (value >>> 8)
    this[offset + 1] = (value & 0xff)
    return offset + 2
}

Buffer.prototype.writeInt32LE = function writeInt32LE(value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
    this[offset + 2] = (value >>> 16)
    this[offset + 3] = (value >>> 24)
    return offset + 4
}

Buffer.prototype.writeInt32BE = function writeInt32BE(value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    if (value < 0) value = 0xffffffff + value + 1
    this[offset] = (value >>> 24)
    this[offset + 1] = (value >>> 16)
    this[offset + 2] = (value >>> 8)
    this[offset + 3] = (value & 0xff)
    return offset + 4
}

Buffer.prototype.writeBigInt64LE = defineBigIntMethod(function writeBigInt64LE(value, offset = 0) {
    return wrtBigUInt64LE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))
})

Buffer.prototype.writeBigInt64BE = defineBigIntMethod(function writeBigInt64BE(value, offset = 0) {
    return wrtBigUInt64BE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))
})

function checkIEEE754(buf, value, offset, ext, max, min) {
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
    if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat(buf, value, offset, littleEndian, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
        checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
    }
    ieee754.write(buf, value, offset, littleEndian, 23, 4)
    return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE(value, offset, noAssert) {
    return writeFloat(this, value, offset, true, noAssert)
}

Buffer.prototype.writeFloatBE = function writeFloatBE(value, offset, noAssert) {
    return writeFloat(this, value, offset, false, noAssert)
}

function writeDouble(buf, value, offset, littleEndian, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
        checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
    }
    ieee754.write(buf, value, offset, littleEndian, 52, 8)
    return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE(value, offset, noAssert) {
    return writeDouble(this, value, offset, true, noAssert)
}

Buffer.prototype.writeDoubleBE = function writeDoubleBE(value, offset, noAssert) {
    return writeDouble(this, value, offset, false, noAssert)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy(target, targetStart, start, end) {
    if (!isInstance(target, Uint8Array)) throw new TypeError('argument should be a Buffer')
    if (!start) start = 0
    if (!end && end !== 0) end = this.length
    if (targetStart >= target.length) targetStart = target.length
    if (!targetStart) targetStart = 0
    if (end > 0 && end < start) end = start

    // Copy 0 bytes; we're done
    if (end === start) return 0
    if (target.length === 0 || this.length === 0) return 0

    // Fatal error conditions
    if (targetStart < 0) {
        throw new RangeError('targetStart out of bounds')
    }
    if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
    if (end < 0) throw new RangeError('sourceEnd out of bounds')

    // Are we oob?
    if (end > this.length) end = this.length
    if (target.length - targetStart < end - start) {
        end = target.length - targetStart + start
    }

    const len = end - start

    if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
        // Use built-in when available, missing from IE11
        this.copyWithin(targetStart, start, end)
    } else {
        Uint8Array.prototype.set.call(
            target,
            this.subarray(start, end),
            targetStart
        )
    }

    return len
}

// Usage:
//    buffer.fill(number[, offset[, end]])
//    buffer.fill(buffer[, offset[, end]])
//    buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill(val, start, end, encoding) {
    // Handle string cases:
    if (typeof val === 'string') {
        if (typeof start === 'string') {
            encoding = start
            start = 0
            end = this.length
        } else if (typeof end === 'string') {
            encoding = end
            end = this.length
        }
        if (encoding !== undefined && typeof encoding !== 'string') {
            throw new TypeError('encoding must be a string')
        }
        if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
            throw new TypeError('Unknown encoding: ' + encoding)
        }
        if (val.length === 1) {
            const code = val.charCodeAt(0)
            if ((encoding === 'utf8' && code < 128) ||
                encoding === 'latin1') {
                // Fast path: If `val` fits into a single byte, use that numeric value.
                val = code
            }
        }
    } else if (typeof val === 'number') {
        val = val & 255
    } else if (typeof val === 'boolean') {
        val = Number(val)
    }

    // Invalid ranges are not set to a default, so can range check early.
    if (start < 0 || this.length < start || this.length < end) {
        throw new RangeError('Out of range index')
    }

    if (end <= start) {
        return this
    }

    start = start >>> 0
    end = end === undefined ? this.length : end >>> 0

    if (!val) val = 0

    let i
    if (typeof val === 'number') {
        for (i = start; i < end; ++i) {
            this[i] = val
        }
    } else {
        const bytes = isInstance(val, Uint8Array)
            ? val
            // @ts-ignore
            : Buffer.from(val, encoding)
        const len = bytes.length
        if (len === 0) {
            throw new TypeError('The value "' + val +
                '" is invalid for argument "value"')
        }
        for (i = 0; i < end - start; ++i) {
            this[i + start] = bytes[i % len]
        }
    }

    return this
}

// CUSTOM ERRORS
// =============

// Simplified versions from Node, changed for Buffer-only usage
const errors = {}
function E(sym, getMessage, Base) {
    function NodeError() {
        const err = new Base(getMessage.apply(null, arguments))

        Object.setPrototypeOf(err, NodeError.prototype)

        // Node.js `err.code` properties are own/enumerable properties.
        err.code = sym
        // Add the error code to the name to include it in the stack trace.
        err.name = `${err.name} [${sym}]`
        // Remove NodeError from the stack trace.
        // @ts-ignore
        if (Error.captureStackTrace) {
            // @ts-ignore
            Error.captureStackTrace(err, NodeError)
        }
        // Access the stack to generate the error message including the error code
        // from the name.
        err.stack // eslint-disable-line no-unused-expressions
        // Reset the name to the actual name.
        delete err.name

        return err
    }

    Object.setPrototypeOf(NodeError.prototype, Base.prototype)
    Object.setPrototypeOf(NodeError, Base)

    NodeError.prototype.toString = function toString() {
        return `${this.name} [${sym}]: ${this.message}`
    }

    errors[sym] = NodeError
}

E('ERR_BUFFER_OUT_OF_BOUNDS',
    function (name) {
        if (name) {
            return `${name} is outside of buffer bounds`
        }

        return 'Attempt to access memory outside buffer bounds'
    }, RangeError)
E('ERR_INVALID_ARG_TYPE',
    function (name, actual) {
        return `The "${name}" argument must be of type number. Received type ${typeof actual}`
    }, TypeError)
E('ERR_OUT_OF_RANGE',
    function (str, range, input) {
        let msg = `The value of "${str}" is out of range.`
        let received = input
        if (Number.isInteger(input) && Math.abs(input) > 2 ** 32) {
            received = addNumericalSeparator(String(input))
        } else if (typeof input === 'bigint') {
            received = String(input)
            if (input > BigInt(2) ** BigInt(32) || input < -(BigInt(2) ** BigInt(32))) {
                received = addNumericalSeparator(received)
            }
            received += 'n'
        }
        msg += ` It must be ${range}. Received ${received}`
        return msg
    }, RangeError)

function addNumericalSeparator(val) {
    let res = ''
    let i = val.length
    const start = val[0] === '-' ? 1 : 0
    for (; i >= start + 4; i -= 3) {
        res = `_${val.slice(i - 3, i)}${res}`
    }
    return `${val.slice(0, i)}${res}`
}

// CHECK FUNCTIONS
// ===============

function checkBounds(buf, offset, byteLength) {
    validateNumber(offset, 'offset')
    if (buf[offset] === undefined || buf[offset + byteLength] === undefined) {
        // @ts-ignore
        boundsError(offset, buf.length - (byteLength + 1))
    }
}

function checkIntBI(value, min, max, buf, offset, byteLength) {
    if (value > max || value < min) {
        const n = typeof min === 'bigint' ? 'n' : ''
        let range
        if (byteLength > 3) {
            if (min === 0 || min === BigInt(0)) {
                range = `>= 0${n} and < 2${n} ** ${(byteLength + 1) * 8}${n}`
            } else {
                range = `>= -(2${n} ** ${(byteLength + 1) * 8 - 1}${n}) and < 2 ** ` +
                    `${(byteLength + 1) * 8 - 1}${n}`
            }
        } else {
            range = `>= ${min}${n} and <= ${max}${n}`
        }
        // @ts-ignore
        throw new errors.ERR_OUT_OF_RANGE('value', range, value)
    }
    checkBounds(buf, offset, byteLength)
}

function validateNumber(value, name) {
    if (typeof value !== 'number') {
        // @ts-ignore
        throw new errors.ERR_INVALID_ARG_TYPE(name, 'number', value)
    }
}

function boundsError(value, length, type) {
    if (Math.floor(value) !== value) {
        validateNumber(value, type)
        // @ts-ignore
        throw new errors.ERR_OUT_OF_RANGE(type || 'offset', 'an integer', value)
    }

    if (length < 0) {
        // @ts-ignore
        throw new errors.ERR_BUFFER_OUT_OF_BOUNDS()
    }
    // @ts-ignore
    throw new errors.ERR_OUT_OF_RANGE(type || 'offset',
        `>= ${type ? 1 : 0} and <= ${length}`,
        value)
}

// HELPER FUNCTIONS
// ================

const INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g

function base64clean(str) {
    // Node takes equal signs as end of the Base64 encoding
    str = str.split('=')[0]
    // Node strips out invalid characters like \n and \t from the string, base64-js does not
    str = str.trim().replace(INVALID_BASE64_RE, '')
    // Node converts strings with length < 2 to ''
    if (str.length < 2) return ''
    // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
    while (str.length % 4 !== 0) {
        str = str + '='
    }
    return str
}

function utf8ToBytes(string, units) {
    units = units || Infinity
    let codePoint
    const length = string.length
    let leadSurrogate = null
    const bytes = []

    for (let i = 0; i < length; ++i) {
        codePoint = string.charCodeAt(i)

        // is surrogate component
        if (codePoint > 0xD7FF && codePoint < 0xE000) {
            // last char was a lead
            if (!leadSurrogate) {
                // no lead yet
                if (codePoint > 0xDBFF) {
                    // unexpected trail
                    if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                    continue
                } else if (i + 1 === length) {
                    // unpaired lead
                    if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                    continue
                }

                // valid lead
                leadSurrogate = codePoint

                continue
            }

            // 2 leads in a row
            if (codePoint < 0xDC00) {
                if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                leadSurrogate = codePoint
                continue
            }

            // valid surrogate pair
            codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
        } else if (leadSurrogate) {
            // valid bmp char, but last char was a lead
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        }

        leadSurrogate = null

        // encode utf8
        if (codePoint < 0x80) {
            if ((units -= 1) < 0) break
            bytes.push(codePoint)
        } else if (codePoint < 0x800) {
            if ((units -= 2) < 0) break
            bytes.push(
                codePoint >> 0x6 | 0xC0,
                codePoint & 0x3F | 0x80
            )
        } else if (codePoint < 0x10000) {
            if ((units -= 3) < 0) break
            bytes.push(
                codePoint >> 0xC | 0xE0,
                codePoint >> 0x6 & 0x3F | 0x80,
                codePoint & 0x3F | 0x80
            )
        } else if (codePoint < 0x110000) {
            if ((units -= 4) < 0) break
            bytes.push(
                codePoint >> 0x12 | 0xF0,
                codePoint >> 0xC & 0x3F | 0x80,
                codePoint >> 0x6 & 0x3F | 0x80,
                codePoint & 0x3F | 0x80
            )
        } else {
            throw new Error('Invalid code point')
        }
    }

    return bytes
}

function asciiToBytes(str) {
    const byteArray = []
    for (let i = 0; i < str.length; ++i) {
        // Node's code seems to be doing this and not & 0x7F..
        byteArray.push(str.charCodeAt(i) & 0xFF)
    }
    return byteArray
}

function utf16leToBytes(str, units) {
    let c, hi, lo
    const byteArray = []
    for (let i = 0; i < str.length; ++i) {
        if ((units -= 2) < 0) break

        c = str.charCodeAt(i)
        hi = c >> 8
        lo = c % 256
        byteArray.push(lo)
        byteArray.push(hi)
    }

    return byteArray
}

function base64ToBytes(str) {
    return base64.toByteArray(base64clean(str))
}

function blitBuffer(src, dst, offset, length) {
    let i
    for (i = 0; i < length; ++i) {
        if ((i + offset >= dst.length) || (i >= src.length)) break
        dst[i + offset] = src[i]
    }
    return i
}

// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
// the `instanceof` check but they should be treated as of that type.
// See: https://github.com/feross/buffer/issues/166
function isInstance(obj, type) {
    return obj instanceof type ||
        (obj != null && obj.constructor != null && obj.constructor.name != null &&
            obj.constructor.name === type.name) ||
        (type === Uint8Array && Buffer.isBuffer(obj))
}
function numberIsNaN(obj) {
    // For IE11 support
    return obj !== obj // eslint-disable-line no-self-compare
}

// Create lookup table for `toString('hex')`
// See: https://github.com/feross/buffer/issues/219
const hexSliceLookupTable = (function () {
    const alphabet = '0123456789abcdef'
    const table = new Array(256)
    for (let i = 0; i < 16; ++i) {
        const i16 = i * 16
        for (let j = 0; j < 16; ++j) {
            table[i16 + j] = alphabet[i] + alphabet[j]
        }
    }
    return table
})()

// hex lookup table for Buffer.from(x, 'hex')
/* eslint-disable no-multi-spaces, indent */
const hexCharValueTable = [
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    0, 1, 2, 3, 4, 5, 6, 7,
    8, 9, -1, -1, -1, -1, -1, -1,
    -1, 10, 11, 12, 13, 14, 15, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, 10, 11, 12, 13, 14, 15, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1
]
/* eslint-enable no-multi-spaces, indent */

// Return not function with Error if BigInt not supported
function defineBigIntMethod(fn) {
    return typeof BigInt === 'undefined' ? BufferBigIntNotDefined : fn
}

function BufferBigIntNotDefined() {
    throw new Error('BigInt not supported')
}

type BufferEncoding =
            | "ascii"
            | "utf8"
            | "utf-8"
            | "utf16le"
            | "ucs2"
            | "ucs-2"
            | "base64"
            | "base64url"
            | "latin1"
            | "binary"
            | "hex";

export interface Buffer extends Uint8Array {
    /**
     * Writes `string` to `buf` at `offset` according to the character encoding in`encoding`. The `length` parameter is the number of bytes to write. If `buf` did
     * not contain enough space to fit the entire string, only part of `string` will be
     * written. However, partially encoded characters will not be written.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.alloc(256);
     *
     * const len = buf.write('\u00bd + \u00bc = \u00be', 0);
     *
     * console.log(`${len} bytes: ${buf.toString('utf8', 0, len)}`);
     * // Prints: 12 bytes: ½ + ¼ = ¾
     *
     * const buffer = Buffer.alloc(10);
     *
     * const length = buffer.write('abcd', 8);
     *
     * console.log(`${length} bytes: ${buffer.toString('utf8', 8, 10)}`);
     * // Prints: 2 bytes : ab
     * ```
     * @since v0.1.90
     * @param string String to write to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write `string`.
     * @param [length=buf.length - offset] Maximum number of bytes to write (written bytes will not exceed `buf.length - offset`).
     * @param [encoding='utf8'] The character encoding of `string`.
     * @return Number of bytes written.
     */
    write(string: string, encoding?: BufferEncoding): number;
    write(string: string, offset: number, encoding?: BufferEncoding): number;
    write(string: string, offset: number, length: number, encoding?: BufferEncoding): number;
    /**
     * Decodes `buf` to a string according to the specified character encoding in`encoding`. `start` and `end` may be passed to decode only a subset of `buf`.
     *
     * If `encoding` is `'utf8'` and a byte sequence in the input is not valid UTF-8,
     * then each invalid byte is replaced with the replacement character `U+FFFD`.
     *
     * The maximum length of a string instance (in UTF-16 code units) is available
     * as {@link constants.MAX_STRING_LENGTH}.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf1 = Buffer.allocUnsafe(26);
     *
     * for (let i = 0; i < 26; i++) {
     *   // 97 is the decimal ASCII value for 'a'.
     *   buf1[i] = i + 97;
     * }
     *
     * console.log(buf1.toString('utf8'));
     * // Prints: abcdefghijklmnopqrstuvwxyz
     * console.log(buf1.toString('utf8', 0, 5));
     * // Prints: abcde
     *
     * const buf2 = Buffer.from('tést');
     *
     * console.log(buf2.toString('hex'));
     * // Prints: 74c3a97374
     * console.log(buf2.toString('utf8', 0, 3));
     * // Prints: té
     * console.log(buf2.toString(undefined, 0, 3));
     * // Prints: té
     * ```
     * @since v0.1.90
     * @param [encoding='utf8'] The character encoding to use.
     * @param [start=0] The byte offset to start decoding at.
     * @param [end=buf.length] The byte offset to stop decoding at (not inclusive).
     */
    toString(encoding?: BufferEncoding, start?: number, end?: number): string;
    /**
     * Returns a JSON representation of `buf`. [`JSON.stringify()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify) implicitly calls
     * this function when stringifying a `Buffer` instance.
     *
     * `Buffer.from()` accepts objects in the format returned from this method.
     * In particular, `Buffer.from(buf.toJSON())` works like `Buffer.from(buf)`.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5]);
     * const json = JSON.stringify(buf);
     *
     * console.log(json);
     * // Prints: {"type":"Buffer","data":[1,2,3,4,5]}
     *
     * const copy = JSON.parse(json, (key, value) => {
     *   return value &#x26;&#x26; value.type === 'Buffer' ?
     *     Buffer.from(value) :
     *     value;
     * });
     *
     * console.log(copy);
     * // Prints: <Buffer 01 02 03 04 05>
     * ```
     * @since v0.9.2
     */
    toJSON(): {
        type: 'Buffer';
        data: number[];
    };
    /**
     * Returns `true` if both `buf` and `otherBuffer` have exactly the same bytes,`false` otherwise. Equivalent to `buf.compare(otherBuffer) === 0`.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf1 = Buffer.from('ABC');
     * const buf2 = Buffer.from('414243', 'hex');
     * const buf3 = Buffer.from('ABCD');
     *
     * console.log(buf1.equals(buf2));
     * // Prints: true
     * console.log(buf1.equals(buf3));
     * // Prints: false
     * ```
     * @since v0.11.13
     * @param otherBuffer A `Buffer` or {@link Uint8Array} with which to compare `buf`.
     */
    equals(otherBuffer: Uint8Array): boolean;
    /**
     * Compares `buf` with `target` and returns a number indicating whether `buf`comes before, after, or is the same as `target` in sort order.
     * Comparison is based on the actual sequence of bytes in each `Buffer`.
     *
     * * `0` is returned if `target` is the same as `buf`
     * * `1` is returned if `target` should come _before_`buf` when sorted.
     * * `-1` is returned if `target` should come _after_`buf` when sorted.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf1 = Buffer.from('ABC');
     * const buf2 = Buffer.from('BCD');
     * const buf3 = Buffer.from('ABCD');
     *
     * console.log(buf1.compare(buf1));
     * // Prints: 0
     * console.log(buf1.compare(buf2));
     * // Prints: -1
     * console.log(buf1.compare(buf3));
     * // Prints: -1
     * console.log(buf2.compare(buf1));
     * // Prints: 1
     * console.log(buf2.compare(buf3));
     * // Prints: 1
     * console.log([buf1, buf2, buf3].sort(Buffer.compare));
     * // Prints: [ <Buffer 41 42 43>, <Buffer 41 42 43 44>, <Buffer 42 43 44> ]
     * // (This result is equal to: [buf1, buf3, buf2].)
     * ```
     *
     * The optional `targetStart`, `targetEnd`, `sourceStart`, and `sourceEnd`arguments can be used to limit the comparison to specific ranges within `target`and `buf` respectively.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf1 = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8, 9]);
     * const buf2 = Buffer.from([5, 6, 7, 8, 9, 1, 2, 3, 4]);
     *
     * console.log(buf1.compare(buf2, 5, 9, 0, 4));
     * // Prints: 0
     * console.log(buf1.compare(buf2, 0, 6, 4));
     * // Prints: -1
     * console.log(buf1.compare(buf2, 5, 6, 5));
     * // Prints: 1
     * ```
     *
     * `ERR_OUT_OF_RANGE` is thrown if `targetStart < 0`, `sourceStart < 0`,`targetEnd > target.byteLength`, or `sourceEnd > source.byteLength`.
     * @since v0.11.13
     * @param target A `Buffer` or {@link Uint8Array} with which to compare `buf`.
     * @param [targetStart=0] The offset within `target` at which to begin comparison.
     * @param [targetEnd=target.length] The offset within `target` at which to end comparison (not inclusive).
     * @param [sourceStart=0] The offset within `buf` at which to begin comparison.
     * @param [sourceEnd=buf.length] The offset within `buf` at which to end comparison (not inclusive).
     */
    compare(target: Uint8Array, targetStart?: number, targetEnd?: number, sourceStart?: number, sourceEnd?: number): -1 | 0 | 1;
    /**
     * Copies data from a region of `buf` to a region in `target`, even if the `target`memory region overlaps with `buf`.
     *
     * [`TypedArray.prototype.set()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/set) performs the same operation, and is available
     * for all TypedArrays, including Node.js `Buffer`s, although it takes
     * different function arguments.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * // Create two `Buffer` instances.
     * const buf1 = Buffer.allocUnsafe(26);
     * const buf2 = Buffer.allocUnsafe(26).fill('!');
     *
     * for (let i = 0; i < 26; i++) {
     *   // 97 is the decimal ASCII value for 'a'.
     *   buf1[i] = i + 97;
     * }
     *
     * // Copy `buf1` bytes 16 through 19 into `buf2` starting at byte 8 of `buf2`.
     * buf1.copy(buf2, 8, 16, 20);
     * // This is equivalent to:
     * // buf2.set(buf1.subarray(16, 20), 8);
     *
     * console.log(buf2.toString('ascii', 0, 25));
     * // Prints: !!!!!!!!qrst!!!!!!!!!!!!!
     * ```
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * // Create a `Buffer` and copy data from one region to an overlapping region
     * // within the same `Buffer`.
     *
     * const buf = Buffer.allocUnsafe(26);
     *
     * for (let i = 0; i < 26; i++) {
     *   // 97 is the decimal ASCII value for 'a'.
     *   buf[i] = i + 97;
     * }
     *
     * buf.copy(buf, 0, 4, 10);
     *
     * console.log(buf.toString());
     * // Prints: efghijghijklmnopqrstuvwxyz
     * ```
     * @since v0.1.90
     * @param target A `Buffer` or {@link Uint8Array} to copy into.
     * @param [targetStart=0] The offset within `target` at which to begin writing.
     * @param [sourceStart=0] The offset within `buf` from which to begin copying.
     * @param [sourceEnd=buf.length] The offset within `buf` at which to stop copying (not inclusive).
     * @return The number of bytes copied.
     */
    copy(target: Uint8Array, targetStart?: number, sourceStart?: number, sourceEnd?: number): number;
    /**
     * Returns a new `Buffer` that references the same memory as the original, but
     * offset and cropped by the `start` and `end` indices.
     *
     * This method is not compatible with the `Uint8Array.prototype.slice()`,
     * which is a superclass of `Buffer`. To copy the slice, use`Uint8Array.prototype.slice()`.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from('buffer');
     *
     * const copiedBuf = Uint8Array.prototype.slice.call(buf);
     * copiedBuf[0]++;
     * console.log(copiedBuf.toString());
     * // Prints: cuffer
     *
     * console.log(buf.toString());
     * // Prints: buffer
     *
     * // With buf.slice(), the original buffer is modified.
     * const notReallyCopiedBuf = buf.slice();
     * notReallyCopiedBuf[0]++;
     * console.log(notReallyCopiedBuf.toString());
     * // Prints: cuffer
     * console.log(buf.toString());
     * // Also prints: cuffer (!)
     * ```
     * @since v0.3.0
     * @deprecated Use `subarray` instead.
     * @param [start=0] Where the new `Buffer` will start.
     * @param [end=buf.length] Where the new `Buffer` will end (not inclusive).
     */
    slice(start?: number, end?: number): Buffer;
    /**
     * Returns a new `Buffer` that references the same memory as the original, but
     * offset and cropped by the `start` and `end` indices.
     *
     * Specifying `end` greater than `buf.length` will return the same result as
     * that of `end` equal to `buf.length`.
     *
     * This method is inherited from [`TypedArray.prototype.subarray()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/subarray).
     *
     * Modifying the new `Buffer` slice will modify the memory in the original `Buffer`because the allocated memory of the two objects overlap.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * // Create a `Buffer` with the ASCII alphabet, take a slice, and modify one byte
     * // from the original `Buffer`.
     *
     * const buf1 = Buffer.allocUnsafe(26);
     *
     * for (let i = 0; i < 26; i++) {
     *   // 97 is the decimal ASCII value for 'a'.
     *   buf1[i] = i + 97;
     * }
     *
     * const buf2 = buf1.subarray(0, 3);
     *
     * console.log(buf2.toString('ascii', 0, buf2.length));
     * // Prints: abc
     *
     * buf1[0] = 33;
     *
     * console.log(buf2.toString('ascii', 0, buf2.length));
     * // Prints: !bc
     * ```
     *
     * Specifying negative indexes causes the slice to be generated relative to the
     * end of `buf` rather than the beginning.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from('buffer');
     *
     * console.log(buf.subarray(-6, -1).toString());
     * // Prints: buffe
     * // (Equivalent to buf.subarray(0, 5).)
     *
     * console.log(buf.subarray(-6, -2).toString());
     * // Prints: buff
     * // (Equivalent to buf.subarray(0, 4).)
     *
     * console.log(buf.subarray(-5, -2).toString());
     * // Prints: uff
     * // (Equivalent to buf.subarray(1, 4).)
     * ```
     * @since v3.0.0
     * @param [start=0] Where the new `Buffer` will start.
     * @param [end=buf.length] Where the new `Buffer` will end (not inclusive).
     */
    subarray(start?: number, end?: number): Buffer;
    /**
     * Writes `value` to `buf` at the specified `offset` as big-endian.
     *
     * `value` is interpreted and written as a two's complement signed integer.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(8);
     *
     * buf.writeBigInt64BE(0x0102030405060708n, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer 01 02 03 04 05 06 07 08>
     * ```
     * @since v12.0.0, v10.20.0
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy: `0 <= offset <= buf.length - 8`.
     * @return `offset` plus the number of bytes written.
     */
    writeBigInt64BE(value: bigint, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as little-endian.
     *
     * `value` is interpreted and written as a two's complement signed integer.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(8);
     *
     * buf.writeBigInt64LE(0x0102030405060708n, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer 08 07 06 05 04 03 02 01>
     * ```
     * @since v12.0.0, v10.20.0
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy: `0 <= offset <= buf.length - 8`.
     * @return `offset` plus the number of bytes written.
     */
    writeBigInt64LE(value: bigint, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as big-endian.
     *
     * This function is also available under the `writeBigUint64BE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(8);
     *
     * buf.writeBigUInt64BE(0xdecafafecacefaden, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer de ca fa fe ca ce fa de>
     * ```
     * @since v12.0.0, v10.20.0
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy: `0 <= offset <= buf.length - 8`.
     * @return `offset` plus the number of bytes written.
     */
    writeBigUInt64BE(value: bigint, offset?: number): number;
    /**
     * @alias Buffer.writeBigUInt64BE
     * @since v14.10.0, v12.19.0
     */
    writeBigUint64BE(value: bigint, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as little-endian
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(8);
     *
     * buf.writeBigUInt64LE(0xdecafafecacefaden, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer de fa ce ca fe fa ca de>
     * ```
     *
     * This function is also available under the `writeBigUint64LE` alias.
     * @since v12.0.0, v10.20.0
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy: `0 <= offset <= buf.length - 8`.
     * @return `offset` plus the number of bytes written.
     */
    writeBigUInt64LE(value: bigint, offset?: number): number;
    /**
     * @alias Buffer.writeBigUInt64LE
     * @since v14.10.0, v12.19.0
     */
    writeBigUint64LE(value: bigint, offset?: number): number;
    /**
     * Writes `byteLength` bytes of `value` to `buf` at the specified `offset`as little-endian. Supports up to 48 bits of accuracy. Behavior is undefined
     * when `value` is anything other than an unsigned integer.
     *
     * This function is also available under the `writeUintLE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(6);
     *
     * buf.writeUIntLE(0x1234567890ab, 0, 6);
     *
     * console.log(buf);
     * // Prints: <Buffer ab 90 78 56 34 12>
     * ```
     * @since v0.5.5
     * @param value Number to be written to `buf`.
     * @param offset Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - byteLength`.
     * @param byteLength Number of bytes to write. Must satisfy `0 < byteLength <= 6`.
     * @return `offset` plus the number of bytes written.
     */
    writeUIntLE(value: number, offset: number, byteLength: number): number;
    /**
     * @alias Buffer.writeUIntLE
     * @since v14.9.0, v12.19.0
     */
    writeUintLE(value: number, offset: number, byteLength: number): number;
    /**
     * Writes `byteLength` bytes of `value` to `buf` at the specified `offset`as big-endian. Supports up to 48 bits of accuracy. Behavior is undefined
     * when `value` is anything other than an unsigned integer.
     *
     * This function is also available under the `writeUintBE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(6);
     *
     * buf.writeUIntBE(0x1234567890ab, 0, 6);
     *
     * console.log(buf);
     * // Prints: <Buffer 12 34 56 78 90 ab>
     * ```
     * @since v0.5.5
     * @param value Number to be written to `buf`.
     * @param offset Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - byteLength`.
     * @param byteLength Number of bytes to write. Must satisfy `0 < byteLength <= 6`.
     * @return `offset` plus the number of bytes written.
     */
    writeUIntBE(value: number, offset: number, byteLength: number): number;
    /**
     * @alias Buffer.writeUIntBE
     * @since v14.9.0, v12.19.0
     */
    writeUintBE(value: number, offset: number, byteLength: number): number;
    /**
     * Writes `byteLength` bytes of `value` to `buf` at the specified `offset`as little-endian. Supports up to 48 bits of accuracy. Behavior is undefined
     * when `value` is anything other than a signed integer.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(6);
     *
     * buf.writeIntLE(0x1234567890ab, 0, 6);
     *
     * console.log(buf);
     * // Prints: <Buffer ab 90 78 56 34 12>
     * ```
     * @since v0.11.15
     * @param value Number to be written to `buf`.
     * @param offset Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - byteLength`.
     * @param byteLength Number of bytes to write. Must satisfy `0 < byteLength <= 6`.
     * @return `offset` plus the number of bytes written.
     */
    writeIntLE(value: number, offset: number, byteLength: number): number;
    /**
     * Writes `byteLength` bytes of `value` to `buf` at the specified `offset`as big-endian. Supports up to 48 bits of accuracy. Behavior is undefined when`value` is anything other than a
     * signed integer.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(6);
     *
     * buf.writeIntBE(0x1234567890ab, 0, 6);
     *
     * console.log(buf);
     * // Prints: <Buffer 12 34 56 78 90 ab>
     * ```
     * @since v0.11.15
     * @param value Number to be written to `buf`.
     * @param offset Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - byteLength`.
     * @param byteLength Number of bytes to write. Must satisfy `0 < byteLength <= 6`.
     * @return `offset` plus the number of bytes written.
     */
    writeIntBE(value: number, offset: number, byteLength: number): number;
    /**
     * Reads an unsigned, big-endian 64-bit integer from `buf` at the specified`offset`.
     *
     * This function is also available under the `readBigUint64BE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff]);
     *
     * console.log(buf.readBigUInt64BE(0));
     * // Prints: 4294967295n
     * ```
     * @since v12.0.0, v10.20.0
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy: `0 <= offset <= buf.length - 8`.
     */
    readBigUInt64BE(offset?: number): bigint;
    /**
     * @alias Buffer.readBigUInt64BE
     * @since v14.10.0, v12.19.0
     */
    readBigUint64BE(offset?: number): bigint;
    /**
     * Reads an unsigned, little-endian 64-bit integer from `buf` at the specified`offset`.
     *
     * This function is also available under the `readBigUint64LE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff]);
     *
     * console.log(buf.readBigUInt64LE(0));
     * // Prints: 18446744069414584320n
     * ```
     * @since v12.0.0, v10.20.0
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy: `0 <= offset <= buf.length - 8`.
     */
    readBigUInt64LE(offset?: number): bigint;
    /**
     * @alias Buffer.readBigUInt64LE
     * @since v14.10.0, v12.19.0
     */
    readBigUint64LE(offset?: number): bigint;
    /**
     * Reads a signed, big-endian 64-bit integer from `buf` at the specified `offset`.
     *
     * Integers read from a `Buffer` are interpreted as two's complement signed
     * values.
     * @since v12.0.0, v10.20.0
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy: `0 <= offset <= buf.length - 8`.
     */
    readBigInt64BE(offset?: number): bigint;
    /**
     * Reads a signed, little-endian 64-bit integer from `buf` at the specified`offset`.
     *
     * Integers read from a `Buffer` are interpreted as two's complement signed
     * values.
     * @since v12.0.0, v10.20.0
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy: `0 <= offset <= buf.length - 8`.
     */
    readBigInt64LE(offset?: number): bigint;
    /**
     * Reads `byteLength` number of bytes from `buf` at the specified `offset`and interprets the result as an unsigned, little-endian integer supporting
     * up to 48 bits of accuracy.
     *
     * This function is also available under the `readUintLE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);
     *
     * console.log(buf.readUIntLE(0, 6).toString(16));
     * // Prints: ab9078563412
     * ```
     * @since v0.11.15
     * @param offset Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - byteLength`.
     * @param byteLength Number of bytes to read. Must satisfy `0 < byteLength <= 6`.
     */
    readUIntLE(offset: number, byteLength: number): number;
    /**
     * @alias Buffer.readUIntLE
     * @since v14.9.0, v12.19.0
     */
    readUintLE(offset: number, byteLength: number): number;
    /**
     * Reads `byteLength` number of bytes from `buf` at the specified `offset`and interprets the result as an unsigned big-endian integer supporting
     * up to 48 bits of accuracy.
     *
     * This function is also available under the `readUintBE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);
     *
     * console.log(buf.readUIntBE(0, 6).toString(16));
     * // Prints: 1234567890ab
     * console.log(buf.readUIntBE(1, 6).toString(16));
     * // Throws ERR_OUT_OF_RANGE.
     * ```
     * @since v0.11.15
     * @param offset Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - byteLength`.
     * @param byteLength Number of bytes to read. Must satisfy `0 < byteLength <= 6`.
     */
    readUIntBE(offset: number, byteLength: number): number;
    /**
     * @alias Buffer.readUIntBE
     * @since v14.9.0, v12.19.0
     */
    readUintBE(offset: number, byteLength: number): number;
    /**
     * Reads `byteLength` number of bytes from `buf` at the specified `offset`and interprets the result as a little-endian, two's complement signed value
     * supporting up to 48 bits of accuracy.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);
     *
     * console.log(buf.readIntLE(0, 6).toString(16));
     * // Prints: -546f87a9cbee
     * ```
     * @since v0.11.15
     * @param offset Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - byteLength`.
     * @param byteLength Number of bytes to read. Must satisfy `0 < byteLength <= 6`.
     */
    readIntLE(offset: number, byteLength: number): number;
    /**
     * Reads `byteLength` number of bytes from `buf` at the specified `offset`and interprets the result as a big-endian, two's complement signed value
     * supporting up to 48 bits of accuracy.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);
     *
     * console.log(buf.readIntBE(0, 6).toString(16));
     * // Prints: 1234567890ab
     * console.log(buf.readIntBE(1, 6).toString(16));
     * // Throws ERR_OUT_OF_RANGE.
     * console.log(buf.readIntBE(1, 0).toString(16));
     * // Throws ERR_OUT_OF_RANGE.
     * ```
     * @since v0.11.15
     * @param offset Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - byteLength`.
     * @param byteLength Number of bytes to read. Must satisfy `0 < byteLength <= 6`.
     */
    readIntBE(offset: number, byteLength: number): number;
    /**
     * Reads an unsigned 8-bit integer from `buf` at the specified `offset`.
     *
     * This function is also available under the `readUint8` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([1, -2]);
     *
     * console.log(buf.readUInt8(0));
     * // Prints: 1
     * console.log(buf.readUInt8(1));
     * // Prints: 254
     * console.log(buf.readUInt8(2));
     * // Throws ERR_OUT_OF_RANGE.
     * ```
     * @since v0.5.0
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 1`.
     */
    readUInt8(offset?: number): number;
    /**
     * @alias Buffer.readUInt8
     * @since v14.9.0, v12.19.0
     */
    readUint8(offset?: number): number;
    /**
     * Reads an unsigned, little-endian 16-bit integer from `buf` at the specified`offset`.
     *
     * This function is also available under the `readUint16LE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x12, 0x34, 0x56]);
     *
     * console.log(buf.readUInt16LE(0).toString(16));
     * // Prints: 3412
     * console.log(buf.readUInt16LE(1).toString(16));
     * // Prints: 5634
     * console.log(buf.readUInt16LE(2).toString(16));
     * // Throws ERR_OUT_OF_RANGE.
     * ```
     * @since v0.5.5
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 2`.
     */
    readUInt16LE(offset?: number): number;
    /**
     * @alias Buffer.readUInt16LE
     * @since v14.9.0, v12.19.0
     */
    readUint16LE(offset?: number): number;
    /**
     * Reads an unsigned, big-endian 16-bit integer from `buf` at the specified`offset`.
     *
     * This function is also available under the `readUint16BE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x12, 0x34, 0x56]);
     *
     * console.log(buf.readUInt16BE(0).toString(16));
     * // Prints: 1234
     * console.log(buf.readUInt16BE(1).toString(16));
     * // Prints: 3456
     * ```
     * @since v0.5.5
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 2`.
     */
    readUInt16BE(offset?: number): number;
    /**
     * @alias Buffer.readUInt16BE
     * @since v14.9.0, v12.19.0
     */
    readUint16BE(offset?: number): number;
    /**
     * Reads an unsigned, little-endian 32-bit integer from `buf` at the specified`offset`.
     *
     * This function is also available under the `readUint32LE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78]);
     *
     * console.log(buf.readUInt32LE(0).toString(16));
     * // Prints: 78563412
     * console.log(buf.readUInt32LE(1).toString(16));
     * // Throws ERR_OUT_OF_RANGE.
     * ```
     * @since v0.5.5
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
     */
    readUInt32LE(offset?: number): number;
    /**
     * @alias Buffer.readUInt32LE
     * @since v14.9.0, v12.19.0
     */
    readUint32LE(offset?: number): number;
    /**
     * Reads an unsigned, big-endian 32-bit integer from `buf` at the specified`offset`.
     *
     * This function is also available under the `readUint32BE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78]);
     *
     * console.log(buf.readUInt32BE(0).toString(16));
     * // Prints: 12345678
     * ```
     * @since v0.5.5
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
     */
    readUInt32BE(offset?: number): number;
    /**
     * @alias Buffer.readUInt32BE
     * @since v14.9.0, v12.19.0
     */
    readUint32BE(offset?: number): number;
    /**
     * Reads a signed 8-bit integer from `buf` at the specified `offset`.
     *
     * Integers read from a `Buffer` are interpreted as two's complement signed values.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([-1, 5]);
     *
     * console.log(buf.readInt8(0));
     * // Prints: -1
     * console.log(buf.readInt8(1));
     * // Prints: 5
     * console.log(buf.readInt8(2));
     * // Throws ERR_OUT_OF_RANGE.
     * ```
     * @since v0.5.0
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 1`.
     */
    readInt8(offset?: number): number;
    /**
     * Reads a signed, little-endian 16-bit integer from `buf` at the specified`offset`.
     *
     * Integers read from a `Buffer` are interpreted as two's complement signed values.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0, 5]);
     *
     * console.log(buf.readInt16LE(0));
     * // Prints: 1280
     * console.log(buf.readInt16LE(1));
     * // Throws ERR_OUT_OF_RANGE.
     * ```
     * @since v0.5.5
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 2`.
     */
    readInt16LE(offset?: number): number;
    /**
     * Reads a signed, big-endian 16-bit integer from `buf` at the specified `offset`.
     *
     * Integers read from a `Buffer` are interpreted as two's complement signed values.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0, 5]);
     *
     * console.log(buf.readInt16BE(0));
     * // Prints: 5
     * ```
     * @since v0.5.5
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 2`.
     */
    readInt16BE(offset?: number): number;
    /**
     * Reads a signed, little-endian 32-bit integer from `buf` at the specified`offset`.
     *
     * Integers read from a `Buffer` are interpreted as two's complement signed values.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0, 0, 0, 5]);
     *
     * console.log(buf.readInt32LE(0));
     * // Prints: 83886080
     * console.log(buf.readInt32LE(1));
     * // Throws ERR_OUT_OF_RANGE.
     * ```
     * @since v0.5.5
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
     */
    readInt32LE(offset?: number): number;
    /**
     * Reads a signed, big-endian 32-bit integer from `buf` at the specified `offset`.
     *
     * Integers read from a `Buffer` are interpreted as two's complement signed values.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([0, 0, 0, 5]);
     *
     * console.log(buf.readInt32BE(0));
     * // Prints: 5
     * ```
     * @since v0.5.5
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
     */
    readInt32BE(offset?: number): number;
    /**
     * Reads a 32-bit, little-endian float from `buf` at the specified `offset`.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([1, 2, 3, 4]);
     *
     * console.log(buf.readFloatLE(0));
     * // Prints: 1.539989614439558e-36
     * console.log(buf.readFloatLE(1));
     * // Throws ERR_OUT_OF_RANGE.
     * ```
     * @since v0.11.15
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
     */
    readFloatLE(offset?: number): number;
    /**
     * Reads a 32-bit, big-endian float from `buf` at the specified `offset`.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([1, 2, 3, 4]);
     *
     * console.log(buf.readFloatBE(0));
     * // Prints: 2.387939260590663e-38
     * ```
     * @since v0.11.15
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
     */
    readFloatBE(offset?: number): number;
    /**
     * Reads a 64-bit, little-endian double from `buf` at the specified `offset`.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);
     *
     * console.log(buf.readDoubleLE(0));
     * // Prints: 5.447603722011605e-270
     * console.log(buf.readDoubleLE(1));
     * // Throws ERR_OUT_OF_RANGE.
     * ```
     * @since v0.11.15
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 8`.
     */
    readDoubleLE(offset?: number): number;
    /**
     * Reads a 64-bit, big-endian double from `buf` at the specified `offset`.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);
     *
     * console.log(buf.readDoubleBE(0));
     * // Prints: 8.20788039913184e-304
     * ```
     * @since v0.11.15
     * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 8`.
     */
    readDoubleBE(offset?: number): number;
    reverse(): this;
    /**
     * Interprets `buf` as an array of unsigned 16-bit integers and swaps the
     * byte order _in-place_. Throws `ERR_INVALID_BUFFER_SIZE` if `buf.length` is not a multiple of 2.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf1 = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8]);
     *
     * console.log(buf1);
     * // Prints: <Buffer 01 02 03 04 05 06 07 08>
     *
     * buf1.swap16();
     *
     * console.log(buf1);
     * // Prints: <Buffer 02 01 04 03 06 05 08 07>
     *
     * const buf2 = Buffer.from([0x1, 0x2, 0x3]);
     *
     * buf2.swap16();
     * // Throws ERR_INVALID_BUFFER_SIZE.
     * ```
     *
     * One convenient use of `buf.swap16()` is to perform a fast in-place conversion
     * between UTF-16 little-endian and UTF-16 big-endian:
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from('This is little-endian UTF-16', 'utf16le');
     * buf.swap16(); // Convert to big-endian UTF-16 text.
     * ```
     * @since v5.10.0
     * @return A reference to `buf`.
     */
    swap16(): Buffer;
    /**
     * Interprets `buf` as an array of unsigned 32-bit integers and swaps the
     * byte order _in-place_. Throws `ERR_INVALID_BUFFER_SIZE` if `buf.length` is not a multiple of 4.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf1 = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8]);
     *
     * console.log(buf1);
     * // Prints: <Buffer 01 02 03 04 05 06 07 08>
     *
     * buf1.swap32();
     *
     * console.log(buf1);
     * // Prints: <Buffer 04 03 02 01 08 07 06 05>
     *
     * const buf2 = Buffer.from([0x1, 0x2, 0x3]);
     *
     * buf2.swap32();
     * // Throws ERR_INVALID_BUFFER_SIZE.
     * ```
     * @since v5.10.0
     * @return A reference to `buf`.
     */
    swap32(): Buffer;
    /**
     * Interprets `buf` as an array of 64-bit numbers and swaps byte order _in-place_.
     * Throws `ERR_INVALID_BUFFER_SIZE` if `buf.length` is not a multiple of 8.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf1 = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8]);
     *
     * console.log(buf1);
     * // Prints: <Buffer 01 02 03 04 05 06 07 08>
     *
     * buf1.swap64();
     *
     * console.log(buf1);
     * // Prints: <Buffer 08 07 06 05 04 03 02 01>
     *
     * const buf2 = Buffer.from([0x1, 0x2, 0x3]);
     *
     * buf2.swap64();
     * // Throws ERR_INVALID_BUFFER_SIZE.
     * ```
     * @since v6.3.0
     * @return A reference to `buf`.
     */
    swap64(): Buffer;
    /**
     * Writes `value` to `buf` at the specified `offset`. `value` must be a
     * valid unsigned 8-bit integer. Behavior is undefined when `value` is anything
     * other than an unsigned 8-bit integer.
     *
     * This function is also available under the `writeUint8` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(4);
     *
     * buf.writeUInt8(0x3, 0);
     * buf.writeUInt8(0x4, 1);
     * buf.writeUInt8(0x23, 2);
     * buf.writeUInt8(0x42, 3);
     *
     * console.log(buf);
     * // Prints: <Buffer 03 04 23 42>
     * ```
     * @since v0.5.0
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 1`.
     * @return `offset` plus the number of bytes written.
     */
    writeUInt8(value: number, offset?: number): number;
    /**
     * @alias Buffer.writeUInt8
     * @since v14.9.0, v12.19.0
     */
    writeUint8(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as little-endian. The `value`must be a valid unsigned 16-bit integer. Behavior is undefined when `value` is
     * anything other than an unsigned 16-bit integer.
     *
     * This function is also available under the `writeUint16LE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(4);
     *
     * buf.writeUInt16LE(0xdead, 0);
     * buf.writeUInt16LE(0xbeef, 2);
     *
     * console.log(buf);
     * // Prints: <Buffer ad de ef be>
     * ```
     * @since v0.5.5
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 2`.
     * @return `offset` plus the number of bytes written.
     */
    writeUInt16LE(value: number, offset?: number): number;
    /**
     * @alias Buffer.writeUInt16LE
     * @since v14.9.0, v12.19.0
     */
    writeUint16LE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as big-endian. The `value`must be a valid unsigned 16-bit integer. Behavior is undefined when `value`is anything other than an
     * unsigned 16-bit integer.
     *
     * This function is also available under the `writeUint16BE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(4);
     *
     * buf.writeUInt16BE(0xdead, 0);
     * buf.writeUInt16BE(0xbeef, 2);
     *
     * console.log(buf);
     * // Prints: <Buffer de ad be ef>
     * ```
     * @since v0.5.5
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 2`.
     * @return `offset` plus the number of bytes written.
     */
    writeUInt16BE(value: number, offset?: number): number;
    /**
     * @alias Buffer.writeUInt16BE
     * @since v14.9.0, v12.19.0
     */
    writeUint16BE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as little-endian. The `value`must be a valid unsigned 32-bit integer. Behavior is undefined when `value` is
     * anything other than an unsigned 32-bit integer.
     *
     * This function is also available under the `writeUint32LE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(4);
     *
     * buf.writeUInt32LE(0xfeedface, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer ce fa ed fe>
     * ```
     * @since v0.5.5
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
     * @return `offset` plus the number of bytes written.
     */
    writeUInt32LE(value: number, offset?: number): number;
    /**
     * @alias Buffer.writeUInt32LE
     * @since v14.9.0, v12.19.0
     */
    writeUint32LE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as big-endian. The `value`must be a valid unsigned 32-bit integer. Behavior is undefined when `value`is anything other than an
     * unsigned 32-bit integer.
     *
     * This function is also available under the `writeUint32BE` alias.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(4);
     *
     * buf.writeUInt32BE(0xfeedface, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer fe ed fa ce>
     * ```
     * @since v0.5.5
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
     * @return `offset` plus the number of bytes written.
     */
    writeUInt32BE(value: number, offset?: number): number;
    /**
     * @alias Buffer.writeUInt32BE
     * @since v14.9.0, v12.19.0
     */
    writeUint32BE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset`. `value` must be a valid
     * signed 8-bit integer. Behavior is undefined when `value` is anything other than
     * a signed 8-bit integer.
     *
     * `value` is interpreted and written as a two's complement signed integer.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(2);
     *
     * buf.writeInt8(2, 0);
     * buf.writeInt8(-2, 1);
     *
     * console.log(buf);
     * // Prints: <Buffer 02 fe>
     * ```
     * @since v0.5.0
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 1`.
     * @return `offset` plus the number of bytes written.
     */
    writeInt8(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as little-endian.  The `value`must be a valid signed 16-bit integer. Behavior is undefined when `value` is
     * anything other than a signed 16-bit integer.
     *
     * The `value` is interpreted and written as a two's complement signed integer.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(2);
     *
     * buf.writeInt16LE(0x0304, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer 04 03>
     * ```
     * @since v0.5.5
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 2`.
     * @return `offset` plus the number of bytes written.
     */
    writeInt16LE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as big-endian.  The `value`must be a valid signed 16-bit integer. Behavior is undefined when `value` is
     * anything other than a signed 16-bit integer.
     *
     * The `value` is interpreted and written as a two's complement signed integer.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(2);
     *
     * buf.writeInt16BE(0x0102, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer 01 02>
     * ```
     * @since v0.5.5
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 2`.
     * @return `offset` plus the number of bytes written.
     */
    writeInt16BE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as little-endian. The `value`must be a valid signed 32-bit integer. Behavior is undefined when `value` is
     * anything other than a signed 32-bit integer.
     *
     * The `value` is interpreted and written as a two's complement signed integer.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(4);
     *
     * buf.writeInt32LE(0x05060708, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer 08 07 06 05>
     * ```
     * @since v0.5.5
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
     * @return `offset` plus the number of bytes written.
     */
    writeInt32LE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as big-endian. The `value`must be a valid signed 32-bit integer. Behavior is undefined when `value` is
     * anything other than a signed 32-bit integer.
     *
     * The `value` is interpreted and written as a two's complement signed integer.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(4);
     *
     * buf.writeInt32BE(0x01020304, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer 01 02 03 04>
     * ```
     * @since v0.5.5
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
     * @return `offset` plus the number of bytes written.
     */
    writeInt32BE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as little-endian. Behavior is
     * undefined when `value` is anything other than a JavaScript number.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(4);
     *
     * buf.writeFloatLE(0xcafebabe, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer bb fe 4a 4f>
     * ```
     * @since v0.11.15
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
     * @return `offset` plus the number of bytes written.
     */
    writeFloatLE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as big-endian. Behavior is
     * undefined when `value` is anything other than a JavaScript number.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(4);
     *
     * buf.writeFloatBE(0xcafebabe, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer 4f 4a fe bb>
     * ```
     * @since v0.11.15
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
     * @return `offset` plus the number of bytes written.
     */
    writeFloatBE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as little-endian. The `value`must be a JavaScript number. Behavior is undefined when `value` is anything
     * other than a JavaScript number.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(8);
     *
     * buf.writeDoubleLE(123.456, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer 77 be 9f 1a 2f dd 5e 40>
     * ```
     * @since v0.11.15
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 8`.
     * @return `offset` plus the number of bytes written.
     */
    writeDoubleLE(value: number, offset?: number): number;
    /**
     * Writes `value` to `buf` at the specified `offset` as big-endian. The `value`must be a JavaScript number. Behavior is undefined when `value` is anything
     * other than a JavaScript number.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(8);
     *
     * buf.writeDoubleBE(123.456, 0);
     *
     * console.log(buf);
     * // Prints: <Buffer 40 5e dd 2f 1a 9f be 77>
     * ```
     * @since v0.11.15
     * @param value Number to be written to `buf`.
     * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 8`.
     * @return `offset` plus the number of bytes written.
     */
    writeDoubleBE(value: number, offset?: number): number;
    /**
     * Fills `buf` with the specified `value`. If the `offset` and `end` are not given,
     * the entire `buf` will be filled:
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * // Fill a `Buffer` with the ASCII character 'h'.
     *
     * const b = Buffer.allocUnsafe(50).fill('h');
     *
     * console.log(b.toString());
     * // Prints: hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
     * ```
     *
     * `value` is coerced to a `uint32` value if it is not a string, `Buffer`, or
     * integer. If the resulting integer is greater than `255` (decimal), `buf` will be
     * filled with `value &#x26; 255`.
     *
     * If the final write of a `fill()` operation falls on a multi-byte character,
     * then only the bytes of that character that fit into `buf` are written:
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * // Fill a `Buffer` with character that takes up two bytes in UTF-8.
     *
     * console.log(Buffer.allocUnsafe(5).fill('\u0222'));
     * // Prints: <Buffer c8 a2 c8 a2 c8>
     * ```
     *
     * If `value` contains invalid characters, it is truncated; if no valid
     * fill data remains, an exception is thrown:
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.allocUnsafe(5);
     *
     * console.log(buf.fill('a'));
     * // Prints: <Buffer 61 61 61 61 61>
     * console.log(buf.fill('aazz', 'hex'));
     * // Prints: <Buffer aa aa aa aa aa>
     * console.log(buf.fill('zz', 'hex'));
     * // Throws an exception.
     * ```
     * @since v0.5.0
     * @param value The value with which to fill `buf`.
     * @param [offset=0] Number of bytes to skip before starting to fill `buf`.
     * @param [end=buf.length] Where to stop filling `buf` (not inclusive).
     * @param [encoding='utf8'] The encoding for `value` if `value` is a string.
     * @return A reference to `buf`.
     */
    fill(value: string | Uint8Array | number, offset?: number, end?: number, encoding?: BufferEncoding): this;
    /**
     * If `value` is:
     *
     * * a string, `value` is interpreted according to the character encoding in`encoding`.
     * * a `Buffer` or [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array), `value` will be used in its entirety.
     * To compare a partial `Buffer`, use `buf.subarray`.
     * * a number, `value` will be interpreted as an unsigned 8-bit integer
     * value between `0` and `255`.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from('this is a buffer');
     *
     * console.log(buf.indexOf('this'));
     * // Prints: 0
     * console.log(buf.indexOf('is'));
     * // Prints: 2
     * console.log(buf.indexOf(Buffer.from('a buffer')));
     * // Prints: 8
     * console.log(buf.indexOf(97));
     * // Prints: 8 (97 is the decimal ASCII value for 'a')
     * console.log(buf.indexOf(Buffer.from('a buffer example')));
     * // Prints: -1
     * console.log(buf.indexOf(Buffer.from('a buffer example').slice(0, 8)));
     * // Prints: 8
     *
     * const utf16Buffer = Buffer.from('\u039a\u0391\u03a3\u03a3\u0395', 'utf16le');
     *
     * console.log(utf16Buffer.indexOf('\u03a3', 0, 'utf16le'));
     * // Prints: 4
     * console.log(utf16Buffer.indexOf('\u03a3', -4, 'utf16le'));
     * // Prints: 6
     * ```
     *
     * If `value` is not a string, number, or `Buffer`, this method will throw a`TypeError`. If `value` is a number, it will be coerced to a valid byte value,
     * an integer between 0 and 255.
     *
     * If `byteOffset` is not a number, it will be coerced to a number. If the result
     * of coercion is `NaN` or `0`, then the entire buffer will be searched. This
     * behavior matches [`String.prototype.indexOf()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf).
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const b = Buffer.from('abcdef');
     *
     * // Passing a value that's a number, but not a valid byte.
     * // Prints: 2, equivalent to searching for 99 or 'c'.
     * console.log(b.indexOf(99.9));
     * console.log(b.indexOf(256 + 99));
     *
     * // Passing a byteOffset that coerces to NaN or 0.
     * // Prints: 1, searching the whole buffer.
     * console.log(b.indexOf('b', undefined));
     * console.log(b.indexOf('b', {}));
     * console.log(b.indexOf('b', null));
     * console.log(b.indexOf('b', []));
     * ```
     *
     * If `value` is an empty string or empty `Buffer` and `byteOffset` is less
     * than `buf.length`, `byteOffset` will be returned. If `value` is empty and`byteOffset` is at least `buf.length`, `buf.length` will be returned.
     * @since v1.5.0
     * @param value What to search for.
     * @param [byteOffset=0] Where to begin searching in `buf`. If negative, then offset is calculated from the end of `buf`.
     * @param [encoding='utf8'] If `value` is a string, this is the encoding used to determine the binary representation of the string that will be searched for in `buf`.
     * @return The index of the first occurrence of `value` in `buf`, or `-1` if `buf` does not contain `value`.
     */
    indexOf(value: string | number | Uint8Array, byteOffset?: number, encoding?: BufferEncoding): number;
    /**
     * Identical to `buf.indexOf()`, except the last occurrence of `value` is found
     * rather than the first occurrence.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from('this buffer is a buffer');
     *
     * console.log(buf.lastIndexOf('this'));
     * // Prints: 0
     * console.log(buf.lastIndexOf('buffer'));
     * // Prints: 17
     * console.log(buf.lastIndexOf(Buffer.from('buffer')));
     * // Prints: 17
     * console.log(buf.lastIndexOf(97));
     * // Prints: 15 (97 is the decimal ASCII value for 'a')
     * console.log(buf.lastIndexOf(Buffer.from('yolo')));
     * // Prints: -1
     * console.log(buf.lastIndexOf('buffer', 5));
     * // Prints: 5
     * console.log(buf.lastIndexOf('buffer', 4));
     * // Prints: -1
     *
     * const utf16Buffer = Buffer.from('\u039a\u0391\u03a3\u03a3\u0395', 'utf16le');
     *
     * console.log(utf16Buffer.lastIndexOf('\u03a3', undefined, 'utf16le'));
     * // Prints: 6
     * console.log(utf16Buffer.lastIndexOf('\u03a3', -5, 'utf16le'));
     * // Prints: 4
     * ```
     *
     * If `value` is not a string, number, or `Buffer`, this method will throw a`TypeError`. If `value` is a number, it will be coerced to a valid byte value,
     * an integer between 0 and 255.
     *
     * If `byteOffset` is not a number, it will be coerced to a number. Any arguments
     * that coerce to `NaN`, like `{}` or `undefined`, will search the whole buffer.
     * This behavior matches [`String.prototype.lastIndexOf()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/lastIndexOf).
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const b = Buffer.from('abcdef');
     *
     * // Passing a value that's a number, but not a valid byte.
     * // Prints: 2, equivalent to searching for 99 or 'c'.
     * console.log(b.lastIndexOf(99.9));
     * console.log(b.lastIndexOf(256 + 99));
     *
     * // Passing a byteOffset that coerces to NaN.
     * // Prints: 1, searching the whole buffer.
     * console.log(b.lastIndexOf('b', undefined));
     * console.log(b.lastIndexOf('b', {}));
     *
     * // Passing a byteOffset that coerces to 0.
     * // Prints: -1, equivalent to passing 0.
     * console.log(b.lastIndexOf('b', null));
     * console.log(b.lastIndexOf('b', []));
     * ```
     *
     * If `value` is an empty string or empty `Buffer`, `byteOffset` will be returned.
     * @since v6.0.0
     * @param value What to search for.
     * @param [byteOffset=buf.length - 1] Where to begin searching in `buf`. If negative, then offset is calculated from the end of `buf`.
     * @param [encoding='utf8'] If `value` is a string, this is the encoding used to determine the binary representation of the string that will be searched for in `buf`.
     * @return The index of the last occurrence of `value` in `buf`, or `-1` if `buf` does not contain `value`.
     */
    lastIndexOf(value: string | number | Uint8Array, byteOffset?: number, encoding?: BufferEncoding): number;
    /**
     * Creates and returns an [iterator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) of `[index, byte]` pairs from the contents
     * of `buf`.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * // Log the entire contents of a `Buffer`.
     *
     * const buf = Buffer.from('buffer');
     *
     * for (const pair of buf.entries()) {
     *   console.log(pair);
     * }
     * // Prints:
     * //   [0, 98]
     * //   [1, 117]
     * //   [2, 102]
     * //   [3, 102]
     * //   [4, 101]
     * //   [5, 114]
     * ```
     * @since v1.1.0
     */
    entries(): IterableIterator<[number, number]>;
    /**
     * Equivalent to `buf.indexOf() !== -1`.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from('this is a buffer');
     *
     * console.log(buf.includes('this'));
     * // Prints: true
     * console.log(buf.includes('is'));
     * // Prints: true
     * console.log(buf.includes(Buffer.from('a buffer')));
     * // Prints: true
     * console.log(buf.includes(97));
     * // Prints: true (97 is the decimal ASCII value for 'a')
     * console.log(buf.includes(Buffer.from('a buffer example')));
     * // Prints: false
     * console.log(buf.includes(Buffer.from('a buffer example').slice(0, 8)));
     * // Prints: true
     * console.log(buf.includes('this', 4));
     * // Prints: false
     * ```
     * @since v5.3.0
     * @param value What to search for.
     * @param [byteOffset=0] Where to begin searching in `buf`. If negative, then offset is calculated from the end of `buf`.
     * @param [encoding='utf8'] If `value` is a string, this is its encoding.
     * @return `true` if `value` was found in `buf`, `false` otherwise.
     */
    includes(value: string | number | Buffer, byteOffset?: number, encoding?: BufferEncoding): boolean;
    /**
     * Creates and returns an [iterator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) of `buf` keys (indices).
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from('buffer');
     *
     * for (const key of buf.keys()) {
     *   console.log(key);
     * }
     * // Prints:
     * //   0
     * //   1
     * //   2
     * //   3
     * //   4
     * //   5
     * ```
     * @since v1.1.0
     */
    keys(): IterableIterator<number>;
    /**
     * Creates and returns an [iterator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) for `buf` values (bytes). This function is
     * called automatically when a `Buffer` is used in a `for..of` statement.
     *
     * ```js
     * import { Buffer } from 'buffer';
     *
     * const buf = Buffer.from('buffer');
     *
     * for (const value of buf.values()) {
     *   console.log(value);
     * }
     * // Prints:
     * //   98
     * //   117
     * //   102
     * //   102
     * //   101
     * //   114
     *
     * for (const value of buf) {
     *   console.log(value);
     * }
     * // Prints:
     * //   98
     * //   117
     * //   102
     * //   102
     * //   101
     * //   114
     * ```
     * @since v1.1.0
     */
    values(): IterableIterator<number>;
}
